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Weak Acids Solutions Library

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289 solutions

Weak Acids

Q. Calculate the acid ionization constant (Ka) for the acid.A 0.180 M solution of a weak acid (HA) has a pH of 2.94.

Solved • Jun 16, 2020

Weak Acids

Q. Calculate the pH of a 0.85M ammonium acetate (CH3COONH4) Solution

Solved • Jun 16, 2020

Weak Acids

Q. For many weak acid or weak base calculations, you can use a simplifying assumption to avoid solving quadratic equations. Classify these situations ...

Solved • Apr 30, 2020

Weak Acids

Q. At a concentration of 1 M, the weak acid HNO2 is 2% ionized and the pH of the solution is 1.7. What happens when KNO2(s) is dissolved into the solu...

Solved • Apr 30, 2020

Weak Acids

Q. Determine the Ka of an acid whose 0.294 M solution has a pH of 2.80.A) 4.9 x 10-7 B ) 1.2x 10-5 C) 8.5 x 10-6 D) 5.4 10-3 E) 27

Solved • Apr 29, 2020

Weak Acids

Q. Find the percent ionization of a 0.337 M HF solution. The Ka for HF is 3.5 x 10-4. A) 4.7% B) 3.2% C) 1.2 x 10-2% D) 3.5 x 10-2%E) 1.1 % 

Solved • Apr 29, 2020

Weak Acids

Q. Determine the [H3O+] in a 0.265 M HCIO solution. The Ka of HCIO is 2.9 x 10-8.A) 1.1 × 10-10 M B) 8.8 × 10-5 M C) 4.9 × 10-4 M D) 7.7 × 10-9 M E) 1...

Solved • Apr 29, 2020

Weak Acids

Q. In a 0.050 M solution of a weak monoprotic acid, [H+] = 1.8 x 10-3. What is its Ka?A. 3.6 x 10-2B. 9.0 x 10-5C. 6.7 x 10-5D. 1.6 x 10-7

Solved • Apr 28, 2020

Weak Acids

Q. What is the percent ionization of a 2 M solution of acetic acid at 25 °C? a) 0.6% b) 0.3% c) 0.0036% d) 0.0018%

Solved • Apr 27, 2020

Weak Acids

Q. In a 1.0 x 10-4 M solution of HCN(aq), identify the relative molar amounts of these species. Arrange from most to least. H2OH3O+HCNOH-CN-

Solved • Apr 15, 2020

Weak Acids

Q. Enough of a monoprotic acid is dissolved in water to produce a 0.0192 M solution. The pH of the resulting solution is 2.53. Calculate the Ka for th...

Solved • Apr 14, 2020

Weak Acids

Q. Find the percent ionization of a 0.250 M solution of HC2H3O2. Express your answer numerically to two significant figures.

Solved • Apr 14, 2020

Weak Acids

Q. A 0.15 M solution of chloroacetic acid has a pH of 1.86. What is the value of Ka for this acid?

Solved • Mar 20, 2020

Weak Acids

Q. In a 1.0x10-4 M solution of HClO(aq), identify the relative molar amounts of these species. (Most to least) HClO H2O H3O OH OCl

Solved • Mar 12, 2020

Weak Acids

Q. Calculate the pH of a 0.10 M solution of HOCl, Ka = 3.5 × 10–8.A) 8.46B) 4.23C) 1.00D) 3.73E) 3.23

Solved • Feb 18, 2020

Weak Acids

Q. Which of the following is the equilibrium constant expression for the dissociation of the weak acid HOCl?B) K = [H+][OCl–]E) none of these

Solved • Feb 18, 2020

Weak Acids

Q. If an acid, HA, is 10.0% dissociated in a 1.0 M solution, what is Ka for this acid?A) 6.3 × 10–2B) 9.1 × 10–2C) 8.1 × 10–1D) 1.1 × 10–2E) none of t...

Solved • Feb 17, 2020

Weak Acids

Q. Based on the table below, mixing acetic acid (CH3CO2H) with which of the following bases will lead to an equilibrium that lies mainly on the produc...

Solved • Feb 10, 2020

Weak Acids

Q. What is the pH of a 0.200 M aqueous solution of phenol, H5C6OH, (Ka = 1.0 x 10-10)?A. 0.70B. 5.3C. 7.0D. 10.E. none of the above

Solved • Feb 10, 2020

Weak Acids

Q. A mixture of two weak acids contains 0.50 M HCN (Ka = 6.2 x 10-10) and 2.00 M HNO2 (Ka = 4.4 x 10-4). What is the concentration of cyanide ions in ...

Solved • Feb 10, 2020

Weak Acids

Q. Sodium azide, NaN3 is an ionic compound consisting of Na+ ions and N3- ions. A 0.50 M solution of NaN3 has a pH of 9.21. Calculate Ka for hydrazoic...

Solved • Feb 7, 2020

Weak Acids

Q. A 0.010 M solution of an acid is 8.0% ionized. What is Ka for this acid?A. 3.2 x 10-6B. 2.8 x 10-5C. 6.4 x 10-6D. 7.0 x 10-5E. 1.6 x 10-4

Solved • Feb 7, 2020

Weak Acids

Q. What is the pH of a 0.34 M solution of a weak acid which has a pKa of 5.40?A. 2.9B. 3.9C. 2.0D. 1.7E. 1.6

Solved • Feb 6, 2020

Weak Acids

Q. A weak acid was 13% ionized. What would be the pH of a 0.50 M solution and what is the pKa of the acid?A. pH = 1.2; pKa = 2.0B. pH = 4.3; pKa = 3.9...

Solved • Feb 6, 2020

Weak Acids

Q. If the pH = 5.35 for a 0.17 M solution of a weak acid (HA), what is Ka for the acid?a. 2.71x10-11 Mb. 1.17x10-10 Mc. 8.14x10-8 Md. 6.01x10-10 Me. 8...

Solved • Jan 27, 2020

Weak Acids

Q. During the analysis of an unknown acid, HA, a 0.010 M solution of the sodium salt of the conjugate base, Na+A–, was found to have a pH of 10.35 at ...

Solved • Dec 20, 2019

Weak Acids

Q. During the analysis of an unknown acid, HA, a 0.010 M solution of the sodium salt of the conjugate base, Na+A–, was found to have a pH of 10.35 at ...

Solved • Dec 20, 2019

Weak Acids

Q. A 0.060 M solution of an acid has a pH of 5.12. Calculate the Ka of the acid. a. 1.04x109b. 1.26x10-4c. 9.59x10-10d. 7.58x10-6e. 9.6x10-11

Solved • Dec 19, 2019

Weak Acids

Q. Calculate the pH of a 0.400 M solution of hypochlorous acid, for which the Ka value is 2.90 x 10-8. Enter your answer with two decimal places.a. 3....

Solved • Dec 19, 2019

Weak Acids

Q. In which of the following aqueous solutions does the weak acid exhibit the highest percentage ionization?a. 0.01 M HF (Ka = 6.8 x 10-4)b. 0.01 M HN...

Solved • Dec 19, 2019

Weak Acids

Q. The Ka of hypochlorous acid (HClO) is 3.0 x 10-8 at 25.0 °C. Calculate the pH of a 0.0335 hypochlorous acid solution.a. 3.50b. 9.00c. 4.50d. 1.47e....

Solved • Dec 19, 2019

Weak Acids

Q. Calculate the pH of a 0.40 M solution of sodium acetate (NaCH3COO) given that the Ka of acetic acid (CH3COOH) is 1.8 x 10-5.a. 2.96b. 4.68c. 3.32d....

Solved • Dec 18, 2019

Weak Acids

Q. The pH of a 0.021 M solution of a weak acid is 3.95. What is the value of Ka for this acid.a. 5.3x10-3b. 5.9x107c. 6.0x10-7d. 1.7x107e. 6.0x10-8

Solved • Dec 18, 2019

Weak Acids

Q. What is the pH of 0.26 M trimethylammonium bromide, (CH3)3NHBr? Enter your answer with two decimal places.The Kb of trimethylamine, (CH3)3N, is 6.3...

Solved • Dec 17, 2019

Weak Acids

Q. What is the pH of 0.72 M ethylammonium chloride, C2H5NH3Cl? The Kb of ethylamine, C2H5NH2, is 4.3 x 10-4.a. 3.22b. 4.71c. 3.81d. 4.57e. 5.40

Solved • Dec 12, 2019

Weak Acids

Q. At a certain temperature, the percent dissociation (ionization) of chlorous acid, HClO2, in a 1.43 M solution water is 8.0%.Calculate the value of ...

Solved • Dec 12, 2019

Weak Acids

Q. Calculate the pH of a 0.300 M solution of formic acid, for which the Ka value is 1.80 x 10-4.a. 4.21b. 2.13c. 5.77d. 1.82e. 1.31

Solved • Dec 12, 2019

Weak Acids

Q. What is the pH of 0.67 M trimethylammonium iodide, (CH3)3NHI? Enter your answer with two decimal places.The Kb of trimethylamine, (CH3)3N, is 6.3 x...

Solved • Dec 12, 2019

Weak Acids

Q. A student planned an experiment that would use 0.10 M propionic acid (HC3H5O2 , Ka = 1.4 × 10–5). Calculate the equilibrium concentration of the hy...

Solved • Nov 13, 2019

Weak Acids

Q. Phenylacetic acid (HPAc) is a modified form of an amino acid phenyl alanine seen in patients with phenylketonuria, an inherited disorder. A study o...

Solved • Nov 12, 2019

Weak Acids

Q. The pH of 0.10 M of an unknown acid is 4.5. Calculate the Ka of the acid.a. 1.0 x 10-9b. 1.0 x 10-8c. 3.16 x 10-5d. 1.0 x 10-10e. 3.16 x 10-6

Solved • Nov 12, 2019

Weak Acids

Q. An acid, HA, has a Ka value = 1.0 × 10-1. At equilibrium, a solution of this acid is found to have a concentration, [HA]eq = 0.1 M. If the concentr...

Solved • Nov 12, 2019

Weak Acids

Q. What is the pH of a 0.015 M aqueous solution of hydrazoic acid (HN 3) (Ka = 1.9 x 10–5) at 25°C?a. 2.89b. 1.82c. 3.28d. 6.55e. 4.87

Solved • Aug 26, 2019

Weak Acids

Q. The Ka of a monoprotic weak acid is  2.08 × 10−3. What is the percent ionization of a .194 M solution of this acid?

Solved • Aug 7, 2019

Weak Acids

Q. Determine the pH of a 0.62 M NH4NO3 solution at 25.0°C. The Kb for NH3 is 1.76 x 10-5.

Solved • Aug 7, 2019

Weak Acids

Q. Calcium acetate (Ca(CH3COO)2) is commonly used as a food additive, especially in candy. What is the pH of a 0.1 M Ca(CH3COO)2 solution at 25 °C

Solved • Aug 6, 2019

Weak Acids

Q. Determine the pH of a 0.62 M NH 4NO3 solution at 25°Celsius. The Kb for NH3 is 1.76 x 10-5

Solved • Jul 9, 2019

Weak Acids

Q. A 1.25 M solution of the weak acid HA is 9.2% dissociated. What is the pH of the solution?

Solved • Jul 9, 2019

Weak Acids

Q. Calculate the percent ionization of 0.0080 M butanoic acid in a solution containing 0.080 M sodium butanoate.

Solved • Jan 3, 2019

Weak Acids

Q. Calculate the percent ionization of a 0.15 M formic acid solution in a solution containing 0.11 M potassium formate.

Solved • Jan 3, 2019

Weak Acids

Q. Solve an equilibrium problem (using an ICE table) to calculate the pH of each of the following solutions.0.16 M CH3 NH3 Cl

Solved • Jan 3, 2019

Weak Acids

Q. Phenol, (C6H5OH), has a Ka of 1.3 x 10-10. Write out the Ka reaction for phenol.

Solved • Dec 13, 2018

Weak Acids

Q. A solution of sodium acetate (NaCH3COO) has a pH of 9.53. The acid-dissociation constant for acetic acid is 1.8 x 10-5. What is the molarity of the...

Solved • Dec 13, 2018

Weak Acids

Q. A 0.30  M solution of a salt NaA has pH=9.15. What is the value of K a for the parent acid HA?

Solved • Dec 13, 2018

Weak Acids

Q. A 0.50 M solution of an acid HA has pH = 2.24. What is the value of Ka for the acid?

Solved • Dec 13, 2018

Weak Acids

Q. A 0.077 M solution of an acid HA has pH = 2.16. What is the percentage of the acid that is ionized?

Solved • Dec 13, 2018

Weak Acids

Q. What is the pH of a 0.40 M solution of benzoic acid, C6H5COOH? (The Ka value for benzoic acid is 6.3 x 10-5.)

Solved • Dec 13, 2018

Weak Acids

Q. What is the pH of a 0.010 M solution of HF? (The Ka value for HF is 6.8 x 10-4.)

Solved • Dec 13, 2018

Weak Acids

Q. The odor of fish is due primarily to amines, especially methylamine (CH3NH2). Fish is often served with a wedge of lemon, which contains citric aci...

Solved • Dec 13, 2018

Weak Acids

Q. The following diagrams represent aqueous solutions of three acids, HX, HY, and HZ. The water molecules have been omitted for clarity, and the hydra...

Solved • Dec 13, 2018

Weak Acids

Q. The acid-dissociation constant for hypochlorous acid (HClO) is 3.0x10 - 8.Calculate the concentration of HClO at equilibrium if the initial concent...

Solved • Dec 13, 2018

Weak Acids

Q. Determine the pH of 9.00×10−2 M hypochlorous acid solution. Ka = 2.9x10-8

Solved • Dec 13, 2018

Weak Acids

Q. The active ingredient in aspirin is acetylsalicylic acid (HC9H7O4), a monoprotic acid with a Ka of 3.3x10-4 at 25°C .What is the pH of a solution o...

Solved • Dec 13, 2018

Weak Acids

Q. Calculate the percent ionization of hydrazoic acid (HN3) in solutions of each of the following concentrations (Ka is given in Appendix D in the tex...

Solved • Dec 13, 2018

Weak Acids

Q. Calculate the percent ionization of propionic acid (C2H5COOH) in solutions of each of the following concentrations (Ka is given in Appendix D in th...

Solved • Dec 13, 2018

Weak Acids

Q. A 0.100 M solution of chloroacetic acid (ClCH2 COOH) is 11.0% ionized.Using this information, calculate [ClCH2 COOH] for chloroacetic acid.

Solved • Dec 13, 2018

Weak Acids

Q. A 0.100 M solution of chloroacetic acid (ClCH2 COOH) is 11.0% ionized.Using this information, calculate Ka for chloroacetic acid.

Solved • Dec 13, 2018

Weak Acids

Q. If a solution of HF (Ka = 6.8x10–4) has a pH of 3.10, calculate the concentration of hydrofluoric acid.

Solved • Dec 13, 2018

Weak Acids

Q. The acid-dissociation constant for benzoic acid (C6H5COOH) is 6.3x10 –5. Calculate the equilibrium concentration of C6H5COOH in the solution if the...

Solved • Dec 13, 2018

Weak Acids

Q. Write the chemical equation and the Ka expression for the acid dissociation of each of the following acids in aqueous solution. First show the reac...

Solved • Dec 13, 2018

Weak Acids

Q. Lactic acid (CH3 CH(OH)COOH) has one acidic hydrogen. A 0.10 M solution of lactic acid has a pH of 2.44.Calculate Ka.

Solved • Dec 13, 2018

Weak Acids

Q. Phenylacetic acid (C6H5CH2COOH + H2O ⇌ C6H5CH2COO- + H3O+) is one of the substances that accumulates in the blood of people with phenylketonuria, a...

Solved • Dec 13, 2018

Weak Acids

Q. Consider the three generic weak acids HA, HB, and HC. The images shown here represent the ionization of each acid at room temperature.Which acid ha...

Solved • Dec 13, 2018

Weak Acids

Q. Which weak acid solution has the greatest percent ionization?(a) 0.100 M HC2H3O2(b) 0.500 M HC2H3O2(c) 0.0100 M HC2H3O2

Solved • Dec 13, 2018

Weak Acids

Q. Find the pH of a 0.276 M NaC2H3O2 solution. (The Ka of acetic acid, HC2H3O2, is 1.8 x 10-5.)        

Solved • Dec 13, 2018

Weak Acids

Q. Find the [H3O+] concentration of a 0.276 M  hydrofluoric acid solution. (The value of Ka for hydrofluoric acid is 6.8 x 10-4.)      

Solved • Dec 13, 2018

Weak Acids

Q. Find the pH of a 0.013 M solution of HNO2. (The value of Ka for HNO2 is 4.6 x 10-4.)

Solved • Dec 13, 2018

Weak Acids

Q. Find the pH of each mixture of acids.0.110 M in formic acid and 5.5×10−2 M in hypochlorous acid

Solved • Dec 13, 2018

Weak Acids

Q. Determine the pH of an HF solution of each of the following concentrations. In which cases can you not make the simplifying assumption that x is sm...

Solved • Dec 13, 2018

Weak Acids

Q. Find the pH and percent ionization of each HF solution. (Ka for HF is 6.8 x 10-4.)Find the percent dissociation of a 0.270 M HF solution.

Solved • Dec 13, 2018

Weak Acids

Q. Find the pH of a 0.205 M HClO2(aq) solution. For HClO2, Ka =0.011.

Solved • Dec 13, 2018

Weak Acids

Q. Calculate the pH of a solution prepared from 0.201 mol of NH4CN and enough water to make 1.00 L of solution.

Solved • Dec 13, 2018

Weak Acids

Q. To 1.0 L of a 0.35 M solution of HClO2 is added 0.18 mol of NaClO.Calculate the [HClO2] at equilibrium.

Solved • Dec 13, 2018

Weak Acids

Q. Lactic acid is a weak acid found in milk. Its calcium salt is a source of calcium for growing animals. A saturated solution of this salt, which we ...

Solved • Dec 13, 2018

Weak Acids

Q. Calculate the pH of a solution that is 1.15×10−3 M in HCl and 1.20×10−2 M in HClO2.

Solved • Dec 13, 2018

Weak Acids

Q. Determine the pH of each of the following two-component solutions.6.00×10−2 M in HI and 8.50×10−3 M in HF

Solved • Dec 13, 2018

Weak Acids

Q. Determine the pH of each of the following two-component solutions.0.133 M in NH4 Cl and 0.155 M in HNO3

Solved • Dec 13, 2018

Weak Acids

Q. Determine the pH of each of the following solutions.0.120 M HClO2

Solved • Dec 13, 2018

Weak Acids

Q. Calculate the concentration of all species in a 0.230 M C6 H5 NH3 Cl solution.

Solved • Dec 13, 2018

Weak Acids

Q. A 0.144 M solution of a monoprotic acid has a percent dissociation of 1.60%.Determine the acid ionization constant (Ka) for the acid.

Solved • Dec 13, 2018

Weak Acids

Q. A 9.0×10−2 M solution of a monoprotic acid has a percent dissociation of 0.60%.Determine the acid ionization constant (Ka) for the acid.

Solved • Dec 13, 2018

Weak Acids

Q. Find the pH of a 0.130 M solution of a weak monoprotic acid having Ka = 1.6×10−5.

Solved • Dec 13, 2018

Weak Acids

Q. Find the pH of each of the following solutions of mixtures of acids.0.155 M in HNO2 and 9.0×10−2 M in HNO3

Solved • Dec 13, 2018

Weak Acids

Q. Find the pH of each of the following solutions of mixtures of acids.0.190 M in HCHO2 and 0.23 M in HC2 H3 O2

Solved • Dec 13, 2018

Weak Acids

Q. Find the pH of each of the following solutions of mixtures of acids.5.5×10−2 M in acetic acid and 5.5×10−2 M in hydrocyanic acid

Solved • Dec 13, 2018

Weak Acids

Q. Determine the pH of an HNO2 solution of each of the following concentrations. In which cases can you not make the simplifying assumption that x is ...

Solved • Dec 13, 2018

Weak Acids

Q. If 20.0 mL of glacial acetic acid (pure HC2 H3 O2) is diluted to 1.50 L with water, what is the pH of the resulting solution? The density of glacia...

Solved • Dec 13, 2018

Weak Acids

Q. Determine the percent ionization of a 0.130 M HCN solution.

Solved • Dec 13, 2018

Weak Acids

Q. Calculate the percent ionization of acetic acid solutions having the following concentrations.1.20 M

Solved • Dec 13, 2018

Weak Acids

Q. Calculate the percent ionization of formic acid solutions having the following concentrations.0.510 M

Solved • Dec 13, 2018