Ch.16 - Aqueous Equilibrium WorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds
Additional Problems
When titrating a strong monoprotic acid and KOH at 25°C, the A) pH will be less than 7 at the equivalence point. B) pH will be greater than 7 at the equivalence point. C) titration will require more moles of base than acid to reach the equivalence point. D) pH will be equal to 7 at the equivalence point. E) titration will require more moles of acid than base to reach the equivalence point.
Consider the following titrations.      I.   100 mL of 0.100 M acetic acid titrated with 0.100 M NaOH      II.  100 mL of 0.100 M acetic acid titrated with 1.00 M NaOH      III. 100 mL of 0.100 M hydrofluoric acid (HF) titrated with 0.100 M NaOH      IV. 100 mL of 0.100 M HCl titrated with 0.100 M NaOH      Which of these titrations produces the most basic solution at the equivalence point?                      A. I                      B. II                      C. III                      D. IV                      E. I and II are the same (and most basic)
At the stoichiometric point in the titration of 0.260 M CH 3NH2(aq) with 0.260 M HCl(aq),  1. [CH3NH2] = 0.130 M. 2. the pH is less than 7. 3. [CH3NH+3] = 0.260 M. 4. the pH is 7.0. 5. the pH is greater than 7
The equivalence point during titration of an acid with a base may not occur at a pH of 7.0 because 1. A solution containing a weak acid or a weak base could never be neutral. 2. hydrolysis of the salt produced may make the solution acidic or basic. 3. the indicator may be one that changes color at some other pH. 4. if a strong acid or base is used, it is completely ionized and therefore not neutral. 5. The statement is false; the pH must be 7.0 at the equivalence point. 
When the analyte HF(aq) is titrated with NaOH(aq), the solution at the stoichiometric point is _______ because _____. (a) acidic; of the hydrolysis (reaction with water) of HF (b) acidic; of the hydrolysis (reaction with water) of H 2O (c) basic; of the hydrolysis (reaction with water) of F  – (d) basic; of the hydrolysis (reaction with water) of NaOH (e) neutral; a salt of a strong acid and strong base are formed.
Consider the titration of 15.0 mL of 0.200 M H 3PO4(aq) with 0.200 M NaOH(aq). What is/are the major species in solution after the addition of 15.0 mL of base? 1. H3PO4(aq) and H2PO4− (aq) 2. H2PO4− (aq) and HPO4− (aq) 3. PO43− (aq) 4. H2PO4− (aq)
How many mL of 0.024 M HCIO 4 would be required to reach the equivalence point in a titration of 32.00 mL of 0.017 M Ca(OH)2? A. 22.67 mL B. 45.33 mL C. 32.00 mL D. 11.33 mL E. 16.00 mL
The question below pertains to a titration where 0.30 M HNO 3 (in a buret) is added to 60.0mL of 0.40 M trimethylamine, (CH 3)3N (in the flask). How is the solution in the flask best characterized after 50. mL of the HNO 3 solution has been added? This is before equivalence point of the titration. (a) the solution is now a weak base (b) the solution is now a weak acid (c) the solution is now a strong base (d) the solution is now a strong acid (e) it is now a neutral solution (f) it is now a buffer solution
How would one characterize the solution in a flask, at the equivalence point, for an experiment where 60.0mL of 0.40 M trimethylamine, (CH 3)3N (in the flask), is  titrated with 0.30 M  HNO3 (in the buret)? (a) the solution is now a weak base (b) the solution is now a weak acid (c) the solution is now a strong base (d) the solution is now a strong acid (e) it is now a neutral solution (f) it is now a  buffer solution
Which of the following is TRUE? A) The equivalence point is where the amount of acid equals the amount of base during an acid-base titration. B) At the equivalence point, the pH is always 7. C) An indicator is not pH sensitive. D) A titration curve is a plot of pH vs. the [base] / [acid] ratio. E) None of the above.
When titrating a STRONG monoprotic acid and KOH at 25°C, the A) pH will be less than 7 at the equivalence point. B) pH will be greater than 7 at the equivalence point. C) titration will require more moles of base than acid to reach the equivalence point. D) pH will be equal to 7 at the equivalence point. E) titration will require more moles of acid than base to reach the equivalence point.
When titrating a WEAK monoprotic acid with NaOH at 25°C, the A) pH will be less than 7 at the equivalence point. B) pH will be equal to 7 at the equivalence point. C) pH will be greater than 7 at the equivalence point. D) titration will require more moles of base than acid to reach the equivalence point. E) titration will require more moles of acid than base to reach the equivalence point.
The following pictures represent solutions at various points in the titration of a weak acid HA with aqueous KOH. Unshaded spheres represent H atoms, black spheres represent oxygen atoms, and shaded spheres represent A- ions. (K+, H3O+, initially present, OH - initially present, and solvent H2O molecules have been omitted for clarity). Which picture below represents the solution at the equivalence point? (a) 1 (b) 2 (c) 3 (d) 4 (e) None of the above.
Consider the titration of a strong acid with a weak base. Which of the following statements is incorrect?  
Consider a titration performed using acetic acid and aqueous ammonia. Which of the following statements is correct?    
If an equal number of moles of weak acid and strong base are added to 1.00L of water, which of the following is true? The resulting solution is acidic The resulting solution is basic The resulting solution is neutral The resulting solution is a buffer None of the above
In a strong base with weak acid titration, which of the following is correct? A. the equivalence point is greater than 7 because only the conjugate base remains B. the equivalence point is greater than 7 because the base is stronger than the acid C. the equivalence point equals 7 because [H3O + ] = [OH - ] D. the equivalence point is less than 7 because only the conjugate acid remains E. the equivalence point is less than 7 because the acid is stronger than the base
Consider the given graph. If the given graph shows the titration of 23.00 mL of an HNO3 solution of an unknown concentration with a 0.135 M LiOH solution, what is the molarity of the acid solution?
Formic acid, Ka = 1.8x10 –4, is the principle component in the venom in stinging ants. What is the molarity of a formic acid solution if 25.00mL of formic acid solution requires 29.80mL of 0.0567M solution of sodium hydroxide to reach the equivalence point? 0.0676M 0.0134M 0.0567M 0.0476M
Consider the titration of 60.0 mL of 0.200 M H 2SO4 solution with 0.150 M of KOH. How many milliliters of KOH are needed to reach the equivalence point?   
A 25.0 L solution is made of 0.10 M acid and 0.13 M conjugate base. What mass of HNO3 (MM = 63.01) in grams can the buffer absorb before one of the components is no longer present? A. 6.30 B. 8.19 C. 47.3 D. 157 E. 205
In a titration a student used 16.60 mL of 0.100 M NaOH to titrate a 0.2000-g sample of an unknown acid. Which of the following acids would the unknown most probably be? Assume that only the hydrogens bonded to oxygen (in BOLD) are titrated by the sodium hydroxide, and that, due to experimental error, the student's value may not be identical with the theoretical value. A. succinic acid. HOOCCH2CH2COOH,molar mass = 118 B. benzoic acid. C6H5COOH. molar mass = 122 C. phthalic acid. C6H4(COOH)2. molar mass = 166 D. oxalic acid. HOOC—COOH. molar mass = 90. E. Not enough information is provided to narrow the selection to one.
Predict whether the equivalence point of each of the following titrations is below, above, or at pH=7.NH3 titrated with HCl
Predict whether the equivalence point of each of the following titrations is below, above, or at pH=7.KOH titrated with HBr
What is the pH at the equivalence point when 0.10 M HNO3 is used to titrate a volume of solution containing 0.30 g of KOH?
Consider the titration of a 25.6 -mL sample of 0.125 M RbOH with 0.110 M HCl. Determine each of the following.the volume of added acid required to reach the equivalence point
Titration of a strong acid with a strong base. The pH curve for titration of 50.0 mL of a 0.100 M solution of hydrochloric acid with a 0.100 M solution of NaOH(aq). For clarity, water molecules have been omitted from the molecular art. What volume of NaOH(aq) would be needed to reach the equivalence point if the concentration of the added base were 0.280 M?
What is the pH at the half-equivalence point in the titration of a weak base with a strong acid? The pKb of the weak base is 8.75.
A saturated solution of Cd(OH)2 is shown in the middle beaker. If hydrochloric acid solution is added, the solubility of Cd(OH)2will increase, causing additional solid to dissolve. Which of the two choices, Beaker A or Beaker B, accurately represents the solution after equilibrium is reestablished? (The water molecules and Cl- ions are omitted for clarity.)
Describe an acid-base titration. What is the equivalence point?
The pH at the equivalence point of the titration of a strong acid with a strong base is 7.0. However, the pH at the equivalence point of the titration of a weak acid with a strong base is above 7.0. Why?
What is the difference between the endpoint and the equivalence point in a titration?
Explain the principles behind an acid-base titration.
The amount of strong acid in the flask shown here is to be titrated by a strong base. Which mark on the burette next to the flask indicates the amount of base required to reach the equivalence point?
The volume required to reach the equivalence point of an acid-base titration depends on the volume and concentration of the acid or base to be titrated and on the concentration of the acid or base used to do the titration. It does not, however, depend on the whether or not the acid or base being titrated is strong or weak. Explain.
In the titration of a strong acid with a strong base, how would you calculate these quantities?initial pH
Why does the titration of a weak acid with a strong base always have a basic equivalence point?
The pH at the equivalence point is above 7.00 for the weak acid titration. Describe the reasons why this statement is true.
Measuring pH during a titration.In which direction do you expect the pH to change as NaOH is added to the HCl solution?
The samples of nitric and acetic acid shown here are both titrated with a 0.100 M solution of NaOH(aq). Determine whether each of the following statements concerning these titrations is true or false. A larger volume of NaOH(aq) is needed to reach the equivalence point in the titration of HNO3.
A 0.552-g sample of ascorbic acid (vitamin C) was dissolved in water to a total volume of 20.0 mL and titrated with 0.1103 M KOH, and the equivalence point occurred at 28.42 mL. The pH of the solution at 10.0 mL of added base was 3.72.From this data, determine the molar mass for vitamin C.
A 0.552-g sample of ascorbic acid (vitamin C) was dissolved in water to a total volume of 20.0 mL and titrated with 0.1103 M KOH, and the equivalence point occurred at 28.42 mL. The pH of the solution at 10.0 mL of added base was 3.72.Determine Ka for vitamin C.
A 0.167-g sample of an unknown acid requires 27.8 mL of 0.100 M NaOH to titrate to the equivalence point. Elemental analysis of the acid gives the following percentages by mass: 40.00% C; 6.71% H; 53.29% O.Determine the molecular formula of this acid.
A 0.167-g sample of an unknown acid requires 27.8 mL of 0.100 M NaOH to titrate to the equivalence point. Elemental analysis of the acid gives the following percentages by mass: 40.00% C; 6.71% H; 53.29% O.Determine the molar mass of the unknown acid.
A sample of 0.1487 g of an unknown monoprotic acid was dissolved in 25.0 mL of water and titrated with 0.1150 M NaOH. The acid required 15.5 mL of base to reach the equivalence point.What is the molecular weight of the acid?
A sample of 0.1487 g of an unknown monoprotic acid was dissolved in 25.0 mL of water and titrated with 0.1150 M NaOH. The acid required 15.5 mL of base to reach the equivalence point.After 7.25 mL of base had been added in the titration, the pH was found to be 2.65. What is the Ka for the unknown acid? (Do not ignore the change, x, in the equation for Ka.)
A weak monoprotic acid is titrated with 0.100 M NaOH. It requires 50.0 mL of the NaOH solution to reach the equivalence point. After 25.0 mL of base is added, the pH of the solution is 3.62.Estimate the pKa of the weak acid.
Predict whether the equivalence point of each of the following titrations is below, above, or at pH=7.NaHCO3 titrated with NaOH
The samples of nitric and acetic acid shown here are both titrated with a 0.100 M solution of NaOH(aq). Determine whether each of the following statements concerning these titrations is true or false. The pH at the equivalence point in the HNO3 titration will be lower than the pH at the equivalence point in the CH3COOH titration.
A sample of 0.2505 g of an unknown monoprotic acid was dissolved in 25.0 mL of water and titrated with 0.0950 M . The acid required 30.0 mL of base to reach the equivalence point.After 15.0 mL of base had been added in the titration, the pH was found to be 6.50. What is the Ka for the unknown acid?
A 0.229-g sample of an unknown monoprotic acid was titrated with 0.112 M NaOH and the resulting titration curve is shown in the figure.Determine the molar mass of the acid.
A 0.1034 -g sample of an unknown monoprotic acid requires 22.20 mL of 0.0600 M NaOH to reach the end point. What is the molecular weight of the unknown acid?
6.74 g of the monoprotic acid KHP (MW = 204.2 g/mol) is dissolved into water. The sample is titrated with a 0.703 M solution of calcium hydroxide to the equivalence point. What volume of base was used?
18.0 mL of 0.126 M diprotic acid (H 2A) was titrated with 0.1021 M KOH. The acid ionization constants for the acid are Ka1 = 5.2 x 10 -5 and Ka2 = 3.4 x 10 -10.a. At what added volume of base does the first equivalence point occur?b. At what added volume of base does the second equivalence point occur?
A buffer contains significant amounts of acetic acid and sodium acetate.a. Write a molecular equation showing how this buffer neutralizes added acid HNO 3.b. Write a molecular equation showing how this buffer neutralizes added base KOH.
What volume of a 0.025 M calcium hydroxide, Ca(OH) 2, solution is needed to completely neutralize 75 mL of a 0.50 M perchloric acid solution, HClO4? 
A chemistry student weighs out 0.0899 g of acetic acid, HC 2H3O2 into a 250 mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.1900 M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the equivalence point.a) 3.07 mLb) 4.08 mLc) 5.48 mLd) 6.15 mLe) 7.88 mL
In the titration of acetic acid (CH 3COOH) with NaOH, when one-half of the acetic acid has been titrated (to the half-equivalence point), the two (2) species present at equal concentrations are _________.a. H+ and OH-b. Na+ and OH-c. CH3COOH and H+d. CH3COO- and CH3COOHe. CH3COO- and H+
For a titration where 0.30 M HNO3 is added to 60.0 mL of 0.40 M trimethylamine, (CH3)3N (in the flask), determine how many mL's of the HNO3 solution need to be added to reach the equivalence point.(a) 100. mL      (b) 60.0 mL      (c) 80.0 mL      (d) 120.0 mL      (e) 70.0 mL 
What volume (in mL) of 0.0500 M phosphoric acid is needed to titrate completely 25.0 mL of 0.150 M barium hydroxide solution to a phenolphthalein end point?3Ba(OH)2 + 2H3PO4 → Ba3(PO4)2 + 6H2O(A) 50.0(B) 75.0(C) 100(D) 150
Given the concentration of a strong base solution (assume a Group IA metal with hydroxide), what is the correct procedure to determine the pH of the solution?A) Set concentration of the base equal to [OH -], convert to [H3O+] and solve for pHB) Find Kb and convert to Ka and use a table to find the equilibrium concentration of [H 3O+] and solve for pHC) Set concentration of the base equal to [H 3O+] and solve for pHD) Use a table to find the equilibrium concentration of the conjugate acid which is equal to [H  3O+] and solve for pHE) Find Kb , and set-up a table to find the equilibrium concentration of [OH -], convert to [H3O+] and solve for pH
In a strong base with weak acid titration, which of the following is correct? A. the equivalence point is greater than 7 because only the conjugate base remains B. the equivalence point is greater than 7 because the base is stronger than the acid C. the equivalence point equals 7 because [H3O+] = [OH-] D. the equivalence point is less than 7 because only the conjugate acid remains E. the equivalence point is less than 7 because the acid is stronger than the base
19.0 mL of 0.126 M diprotic acid (H 2A) was titrated with 0.1017 M KOH. The acid ionization constants for the acid are Ka1= 5.2x10-5 and Ka2= 3.4x10-10.a. At what added volume in mL of base does the first equivalence point occur?b. At what added volume in mL of base does the second equivalence point occur?
When titrating a strong monoprotic acid and KOH at 25° Celsius, thea. pH will be less than 7 at the equivalence pointb. pH will be greater than 7 at the equivalence pointc. pH will be equal to 7 at the equivalence pointd. titration will require more moles of base than acid to reach the equivalence pointe. titration will require more moles of acid than base to reach the equivalence point
When titrating a weak monoprotic acid with NaOH at 25° Celsius. thea. pH will be less than 7 at the equivalence pointb. pH will be equal to 7 at the equivalence pointc. pH will be greater than 7 at the equivalence pointd. titration will require more moles of base than acid to reach the equivalence pointe. titration will require more moles of acid than base to reach the equivalence point
When a strong acid is titrated with a strong base, the pH at the equivalence point  a) is equal to 7.0 b) is greater than 7.0 c) is less than 7.0, but is not 3.5 d) is equal to the pKa of the acid e) is equal to 3.5
Calculate the mass of benzoic acid (molar mass = 122.12 g/mol) sample titrated if 29.11 mL of a standardized 0.5130 mol/L NaOH solution was required to reach the equivalence point of the titration. Benzoic acid is a monoprotic acid. a. 0.01493 g b. 0.2384 g c. 0.9118 g d. 1.824 g e. 3.647 g
100.0 mL of a natural water sample was titrated with NaOH. 13.91 mL of 0.1933 M NaOH solution was required to titrate the water sample to a light pink phenolphthalein endpoint. Calculate the number of millimoles of NaOH required for the titration.
Nitrous acid, HNO2 has a Ka of 4.6 x 10-4. If the 100 mL of a 0.2 M solution of nitrous acid is mixed with a 200 mL of a 0.1 M solution of NaOH which of the following is NOT true of the resulting solution? 1. [Na+] > [H 3O +] 2. [NO2-] = [OH -] 3. they are all true 4. [NO2-] > [HNO 2] 5. [OH-] > [H3O+]
Match each type of titration to its pH at the equivalence point.Weak acid, strong baseStrong acid, strong baseWeak base, strong acidpH less than 7pH equal to 7pH greater than 7
When a 0.25 M HCl solution reacts with 10.0 mL of a 0.30 M C  6H5NH2 solution the pH at the equivalence point will be:a) Less than 7.b) More than 7.c) Equal to 7.
When a 0.25 M HIO3 solution reacts with 10.0 mL of a 0.30 M K 2O solution the pH at the equivalence point will be:a) Less than 7.b) More than 7.c) Equal to 7.
When a 0.25 M H 3PO4 solution reacts with 10.0 mL of a 0.30 M BaH 2 solution the pH at the equivalence point will be:a) Less than 7.b) More than 7.c) Equal to 7.
Consider the titration of 50.0 mL of 0.125 M H  3PO4 with 0.160 M Ba(NH2)2. How many milliliters of the 0.160 M Ba(NH2)2 are needed to reach the equivalence point? 
Assume that 31.0 mL of a 0.10 M solution of a weak base B that accepts one proton is titrated with a 0.10 M solution of the monoprotic strong acid HA.Is the pH 7, less than 7, or more than 7 at the equivalence point?
How many milliliters of 0.110 M  HCl are needed to titrate each of the following solutions to the equivalence point?23.0 mL of 0.118 M  NH3
Two 21.0 mL samples, one 0.200 M KOH and the other 0.200 M CH3NH2, were titrated with 0.100 M HI. Answer each of the following questions regarding these two titrations.What is the volume of added acid at the equivalence point for CH3NH2?
Consider the titration of a 26.0-mL sample of 0.175 M CH3NH2 with 0.155 M HBr. Determine each of the following.the volume of added acid required to reach the equivalence point
How many milliliters of 0.100 M NaOH are needed to completely neutralize 25.0 mL of 0.250 M H3PO4 ?a. 62.5 mL       b. 125 mL       c. 31.3 mL       d. 188 mLe. 78.1 mL   
In a titration of HNO3, you add a few drops of phenolphthalein indicator to 50.00 mL of acid in a flask. You quickly add 20.00 mL of 0.0502 M NaOH but overshoot the end point, and the solution turns deep pink. Instead of starting over, you add 30.00 mL of the acid, and the solution turns colorless. Then, it takes 3.22 mL of the NaOH to reach the end point.What is the concentration of the HNO3 solution?
In a titration of HNO3, you add a few drops of phenolphthalein indicator to 50.00 mL of acid in a flask. You quickly add 20.00 mL of 0.0502 M NaOH but overshoot the end point, and the solution turns deep pink. Instead of starting over, you add 30.00 mL of the acid, and the solution turns colorless. Then, it takes 3.22 mL of the NaOH to reach the end point.How many moles of NaOH were in excess after the first addition?
Two 26.0  mL samples, one 0.100 M HCl and the other 0.100 M HF, were titrated with 0.200 M KOH. Answer each of the following questions regarding these two titrations.What is the volume of added base at the equivalence point for HCl?
Consider the titration of a 36.0 mL sample of 0.175 M  HBr with 0.205 M KOH. Determine each of the following:the volume of added base required to reach the equivalence point
Two 25.0-mL aqueous solutions, labeled A and B, contain the ions indicated:If each sphere represents 1.0×10−3 mol of ion, will the equivalence point have been reached when all of B has been added to A?
Two 25.0-mL aqueous solutions, labeled A and B, contain the ions indicated:What additional volume (mL) of B must be added to reach the equivalence point?
A 25.0 mL sample of an unknown HBr solution is titrated with 0.100 M NaOH. The equivalence point is reached upon the addition of 18.88 mL of the base. What is the concentration of the HBr solution?
How many milliliters of 0.110 M  HCl are needed to titrate each of the following solutions to the equivalence point?50.0 mL of 0.0950 M  NaOH
How many milliliters of 0.110 M  HCl are needed to titrate each of the following solutions to the equivalence point?130.0 mL of a solution that contains 1.35 g of NaOH per liter
Calculate the pH at the equivalence point in titrating 0.120 M solutions of each of the following acids with a solution 0.090 M in NaOH.hydrobromic acid (HBr)
Two 21.0 mL samples, one 0.200 M KOH and the other 0.200 M CH3NH2, were titrated with 0.100 M HI. Answer each of the following questions regarding these two titrations.What is the volume of added acid at the equivalence point for KOH?
Calculate the volume of 1.50 x 10 -2 M NaOH that must be added to 500.0 mL of 0.200 M HCl to give a solution that has pH = 2.15.
What volume (in mL) of 0.200 M NaOH do we need to titrate 36.00 mL of 0.140 M HBr to the equivalence point?
A 26.00-mL sample of an unknown HClO4 solution requires titration with 21.92 mL of 0.2100 M NaOH to reach the equivalence point. What is the concentration of the unknown HClO4 solution? The neutralization reaction is: HClO4(aq) + NaOH(aq) → H2O(l) + NaClO4(aq)
Consider the titration of 150.0 mL of 0.100 M HI by 0.250 M NaOH.b. What volume of NaOH must be added so that the pH = 7.00?
An ecobotanist separates the components of a tropical bark extract by chromatography. She discovers a large proportion of quinidine, a dextrorotatory isomer of quinine used for control of arrhythmic heartbeat. Quinidine has two basic nitrogens (Kb1 = 4.0 × 10−6 and Kb2 = 1.0 × 10−10). To measure the concentration of quinidine, she carries out a titration. Because of the low solubility of quinidine, she first protonates both nitrogens with excess HCl and titrates the acidified solution with standardized base. A 33.85-mg sample of quinidine (ℳ = 324.41 g/mol) is acidified with 6.55 mL of 0.150 M HCl.(a) How many milliliters of 0.0133 M NaOH are needed to titrate the excess HCl?
What quantity (moles) of HCl(g) must be added to 1.0 L of 2.0 M NaOH to achieve a pH of 0.00? (Neglect any volume changes.)
Two 26.0  mL samples, one 0.100 M HCl and the other 0.100 M HF, were titrated with 0.200 M KOH. Answer each of the following questions regarding these two titrations.Predict whether the pH at the equivalence point for each titration will be acidic, basic, or neutral.
Consider these three titrations:(i) the titration of 25.0 mL of a 0.100 M monoprotic weak acid with 0.100 M NaOH(ii) the titration of 25.0 mL of a 0.100 M diprotic weak acid with 0.100 M NaOH(iii) the titration of 25.0 mL of a 0.100 M strong acid with 0.100 M NaOHWhich statement is most likely to be true?(a) All three titrations have the same initial pH.(b) All three titrations have the same pH at their first equivalence points.(c) All three titrations require the same volume of NaOH to reach their first equivalence points.
Consider the following three solutions:(i) 0.10 M solution of a weak monoprotic acid(ii) 0.10 M solution of strong monoprotic acid(iii) 0.10 M solution of a weak diprotic acidEach solution is titrated with 0.15 M NaOH. Which of the following will be the same for all three solutions?a. the volume required to reach the final equivalence pointb. the volume required to reach the first equivalence pointc. the pH at the first equivalence pointd. the pH at one-half the first equivalence point
Two monoprotic acid solutions (A and B) are titrated with identical NaOH solutions. The volume to reach the equivalence point for solution A is twice the volume required to reach the equivalence point for solution B, and the pH at the equivalence point of solution A is higher than the pH at the equivalence point for solution B. Which statement is true?a. The acid in solution A is more concentrated than in solution B and is also a stronger acid than that in solution B.b. The acid in solution A is less concentrated than in solution B and is also a weaker acid than that in solution B.c. The acid in solution A is more concentrated than in solution B and is also a weaker acid than that in solution B.d. The acid in solution A is less concentrated than in solution B and is also a stronger acid than that in solution B.
Three 15.0 mL acid samples – 0.40 M HA, 0.40 M HB, and 0.40 M H2C – are all titrated with 0.100 M NaOH. HA is a weak acid, HB a strong acid, and H2C a diprotic acid. Which statement is true of all three titrations?a) All three titrations have the same pH at the first equivalence point.b) All three titrations have the same initial pH.c) All three titrations have the same final pH.d) All three titrations require the same volume of NaOH
Scenes A to D represent tiny portions of 0.10 M aqueous solutions of a weak acid HA (red and blue; Ka = 4.5×10−5), its conjugate base A−(red), or a mixture of the two (only these two species are shown):(d) Which scene represents the titration at its equivalence point?
Assume that 31.0 mL of a 0.10 M solution of a weak base B that accepts one proton is titrated with a 0.10 M solution of the monoprotic strong acid HA.What is the predominant form of B at the equivalence point?
Consider the titration of a generic weak acid HA with a strong base that gives the following titration curve:On the curve, indicate the points that correspond to the following:a. the stoichiometric (equivalence) point
Consider the titration of a generic weak acid HA with a strong base that gives the following titration curve:On the curve, indicate the points that correspond to the following:b. the region with maximum buffering
Consider the titration of a generic weak acid HA with a strong base that gives the following titration curve:On the curve, indicate the points that correspond to the following:c. pH = pKa
Consider the titration of a generic weak acid HA with a strong base that gives the following titration curve:On the curve, indicate the points that correspond to the following:d. pH depends only on [HA]
Consider the titration of a generic weak acid HA with a strong base that gives the following titration curve:On the curve, indicate the points that correspond to the following:e. pH depends only on [A-]
Consider the titration of a generic weak acid HA with a strong base that gives the following titration curve:On the curve, indicate the points that correspond to the following:f. pH depends only on the amount of excess strong base added
Sketch the titration curve for the titration of a generic weak base B with a strong acid. The titration reaction isB + H+ ⇌ BH+On this curve, indicate the points that correspond to the following:a. the stoichiometric (equivalence) point
Sketch the titration curve for the titration of a generic weak base B with a strong acid. The titration reaction isB + H+ ⇌ BH+On this curve, indicate the points that correspond to the following:b. the region with maximum buffering
Sketch the titration curve for the titration of a generic weak base B with a strong acid. The titration reaction isB + H+ ⇌ BH+On this curve, indicate the points that correspond to the following:c. pH = pKa
Sketch the titration curve for the titration of a generic weak base B with a strong acid. The titration reaction isB + H+ ⇌ BH+On this curve, indicate the points that correspond to the following:d. pH depends only on [B]
Sketch the titration curve for the titration of a generic weak base B with a strong acid. The titration reaction isB + H+ ⇌ BH+On this curve, indicate the points that correspond to the following:e. pH depends only on [BH+]
Sketch the titration curve for the titration of a generic weak base B with a strong acid. The titration reaction isB + H+ ⇌ BH+On this curve, indicate the points that correspond to the following:f. pH depends only on the amount of excess strong acid added
Why is pH at the equivalence point larger than 7 when you titrate a weak acid with a strong base?
Two 21.0 mL samples, one 0.200 M KOH and the other 0.200 M CH3NH2, were titrated with 0.100 M HI. Answer each of the following questions regarding these two titrations.Predict whether the pH at the equivalence point for each titration will be acidic, basic, or neutral.
Two 21.0 mL samples, one 0.200 M KOH and the other 0.200 M CH3NH2, were titrated with 0.100 M HI. Answer each of the following questions regarding these two titrations.Predict which titration curve will have the lowest initial pH.
A 31.00 mL sample of an unknown H3PO4 solution is titrated with a 0.120 M NaOH solution. The equivalence point is reached when 26.43 mL of NaOH solution is added. What is the concentration of the unknown H3PO4 solution? The neutralization reaction is H3PO4 (aq) + 3 NaOH(aq) → 3 H2O(l) + Na3PO4(aq)
Two 26.0  mL samples, one 0.100 M HCl and the other 0.100 M HF, were titrated with 0.200 M KOH. Answer each of the following questions regarding these two titrations.What is the volume of added base at the equivalence point for HF?
In analytical chemistry, bases used for titrations must often be standardized; that is, their concentration must be precisely determined. Standardization of sodium hydroxide solutions is often accomplished by titrating potassium hydrogen phthalate (KHC8H4O4), also know as KHP, with the NaOH solution to be standardized.The titration of 0.5531 g of KHP required 25.83 mL of an NaOH solution to reach the equivalence point. What is the concentration of the NaOH solution?
An experiment requires 50.0 mL of 0.040 M NaOH for the titration of 1.00 mmol of acid. Mass analysis of the acid shows 2.24% hydrogen, 26.7% carbon, and 71.1% oxygen. Draw the Lewis structure of the acid.
A 0.5226-g sample of an unknown monoprotic acid was titrated with 9.96×10−2 M NaOH. The equivalence point of the titration occurs at 23.82 mL. Determine the molar mass of the unknown acid.
Calculate the pH at the equivalence point in titrating 0.120 M solutions of each of the following acids with a solution 0.090 M in NaOH.chlorous acid (HClO2)
Calculate the pH at the equivalence point in titrating 0.120 M solutions of each of the following acids with a solution 0.090 M in NaOH.benzoic acid (C6H5COOH)
The titration of a 20.0-mL sample of an H2SO4 solution of unknown concentration requires 22.51 mL of a 0.156 M KOH solution to reach the equivalence point. What is the concentration of the unknown H2SO4 solution?
A certain acetic acid solution has pH = 2.68. Calculate the volume of 0.0975 M KOH required to reach the equivalence point in the titration of 25.0 mL of the acetic acid solution.
Consider the titration of a 23.0-mL sample of 0.110 M HC2H3O2 with 0.130 M NaOH. Determine each of the following.the volume of added base required to reach the equivalence point
A student intends to titrate a solution of a weak monoprotic acid with a sodium hydroxide solution but reverses the two solutions and places the weak acid solution in the buret. After 23.75 mL of the weak acid solution has been added to 50.0 mL of the 0.100 M NaOH solution, the pH of the resulting solution is 10.50. Calculate the original concentration of the solution of weak acid.
A 0.446-g sample of an unknown monoprotic acid was titrated with 0.105 M KOH and the resulting titration curve is shown in the figure.Determine the molar mass of the acid.
A 35.00-mL solution of 0.2500 M HF is titrated with a standardized 0.1532 M solution of NaOH at 25°C.(b) How many milliliters of titrant are required to reach the equivalence point?
A chemistry student weighs out 0.165 g of hypobromous acid (HBrO) into a 250 mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.0500 M NaOH solution Calculate the volume of NaOH solution the student will need to add to reach the equivalence pant. Be sure your answer has the correct number of significant digits.
Part AWhat is the molarity of a solution of HCl if 6.00 mL of the HCl solution is titrated with 33.0 mL of a 0.170 M NaOH solution? HCl (aq) + NaOH (aq) → H2O (l) + NaCl (aq) Express your answer with the appropriate units.
Calculate the volume, in milliliters, of a 0.19 M NaOH solution that will completely neutralize each of the following: Part A 30.0 mL of a 0.295 M HCl solution. Part B13.0 mL of a 0.560 M H2SO4 solution.
What volume of a 0.187 M potassium hydroxide solution is required to neutralize 18.8 mL of a 0.300 M hydroiodic acid solution? 
What volume, in milliliters, of 0.46 M Ca(OH)2 is needed to completely neutralize 203.6 mL of a 0.31 M HI solution?
The strong acid HNO3 is titrated with the strong base KOH. What substance(s) are present at the equivalence point? HNO3 KOH HNO3 and KNO3 KOH and KNO3 KNO3 
An aqueous solution of hydrobromic acid is standardized by titration with a 0.152 M solution of sodium hydroxide. If 28.6 mL of base are required to neutralize 29.1 mL of the acid, what is the molarity of the hydrobromic acid solution?
What volume of a 0.306 M perchloric acid solution is required to neutralize, 11.3 mL of a 0.137 M potassium hydroxide solution? 
An aqueous solution of  calcium hydroxide is standardized by titration with a  0.116 M solution of hydroiodic acid.If 23.6 mL of base are required to  25.9 mL of the acid, what is the molarity of the  calcium hydroxide solution? 
A volume of 80.0 mL of a 0.610 M HNO3 solution is titrated with 0.150 M KOH. Calculate the volume of KOH required to reach the equivalence point. Express your answer to three significant figures, and include the appropriate units.
What is the concentration of an HBr solution if 31.0 mL of a 0.200 M NaOH solution are needed to titrate 55.0 mL of the acid? 
In a titration experiment, a student used 24.13 mL of 0.111 M sodium hydroxide to neutralize 20.00 mL of a hydrochloric acid solution. What was the molarity of the acid solution? Express your answer to three significant figures and include the appropriate units.
Suppose you have 50.1 mL of a solution of HC 2H3O2. You titrate it with a 0.10 M solution of NaOH and use 15.5 mL to reach the endpoint. What is the concentration of HC2H3O2?What was the pH of the original HC 2H3O2 solution?
What is the concentration of an HCI solution if 39.0 mL of a 0.100M KOH solution are needed to titrate 45.0 mL of the acid? 
Which of the following titrations result in an acidic solution at the equivalence point?a. HCl titrated with NaOHb. KF titrated with KOHc. C5H5N titrated with HCld. CH3COOH titrated with NaOH 
By titration it is found that 88.3 mL of 0.101 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution. 
What volume of a 0.182 M hydrobromic acid solution is required to neutralize 17.2 mL of a 0.191 M calcium hydroxide solution?