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332 solutions

Buffer

Q. A buffer contains significant amounts of ammonia and ammonium chloride.PART A : Enter an equation showing how this buffer neutralizes added aqueous...

Solved • Jun 15, 2020

Buffer

Q. Calculate the pH after 0.020 mole of NaOH is added to 1.00 L of each of the following solutions:a. pure H2Ob. a mixture containing 0.100 M HC3H5O2 ...

Solved • May 7, 2020

Buffer

Q. Which of the following could be added to a solution of sodium acetate to produce a buffer?  acetic acid                 hydrochloric acid          ...

Solved • Apr 30, 2020

Buffer

Q. If a buffer solution is 0.150 M in a weak base (Kb=7.5x10-5m) and 0.530 M in its conjugate acid, what is the pH?

Solved • Apr 30, 2020

Buffer

Q. Calculate the pH of a solution formed by mixing 250.0 mL of 0.15 M NH4CI with 100.0 mL of  0.20 M NH3. The Kb for NH3 is 1.8 x 10-5. A) 8.98 B) 9.2...

Solved • Apr 29, 2020

Buffer

Q. Calculate the pH of a buffer that is 0.058 M HF and 0.058 M LiF. The Ka for HF is 3.5 x 10-4. A) 9.31 B) 2.86 C) 4.69 D) 3.46 E) 10.54

Solved • Apr 29, 2020

Buffer

Q. Which of the following solutions is a good buffer system? A) a solution that is 0.10 M NaOH and 0.10 M HNO3 B) a solution that is 0.10 M NaCl and 0...

Solved • Apr 29, 2020

Buffer

Q. What concentrations of acetic acid (pKa = 4.76) and acetate would be required to prepare a 0.20 M buffer solution at pH 4.5? Enter your answer to t...

Solved • Apr 29, 2020

Buffer

Q. Which set of compounds would form a buffer in aqueous solution?Drag each item to the appropriate bin.NaF and KFNaCl and KClHCl and KClHF and NaFHCO...

Solved • Apr 29, 2020

Buffer

Q. Which weak acid would be best to use when preparing a buffer solution with a pH of 9.90? a) An acid with Ka = 7.9 times 10-12 b) An acid with Ka = ...

Solved • Apr 29, 2020

Buffer

Q. Determine whether the compounds below could be used to prepare an buffer solution.

Solved • Apr 29, 2020

Buffer

Q. Select the statements that correctly describe buffers. a) The pH of a buffer solution does not change significantly when any amount of a strong aci...

Solved • Apr 29, 2020

Buffer

Q. Which weak acid would be best to use when preparing a buffer solution with a pH of 8.20? a) An acid with Ka = 1.0 x10-3 M b) An acid with Ka = 1.0x...

Solved • Apr 28, 2020

Buffer

Q. Which of the following solutions can not act as a buffer?A. KCN/HCNB. NaI/HIC. Na2SO4/NaHSO4D. Na3PO4/Na2HPO4E. NH3/NH4NO3

Solved • Apr 27, 2020

Buffer

Q. Reactions in a buffer solutionWhen an acid or a base is added to a buffer, a double-displacement reaction will occur. The acid or base will be neut...

Solved • Apr 23, 2020

Buffer

Q. Which of the following aqueous mixtures would be a buffer system?A) HCl, NaClB) HNO3, NaNO3C) H3PO4, H2PO4-D) H2SO4, CH3COOHE) NH3, NaOH

Solved • Apr 21, 2020

Buffer

Q. The dissociation of H2PO4- to HPO42- has a pKa of 7.2. For a 0.2 M phosphate buffer at pH 7.5, calculate the following values.a. the ratio of HPO42...

Solved • Apr 21, 2020

Buffer

Q. Calculate the pH of the following solutions: Buffer 1: 25.0 mL of 0.20 M acetic acid with 35.0 mL of 0.10 M NaOH. Buffer 2: 50.0 mL of 0.18 M NH3 w...

Solved • Apr 21, 2020

Buffer

Q. Which combination is the best choice to prepare a buffer with a pH of 5.0?a) HNO2;NaNO2 (pKa for HNO2 is 3.33)b) C5H5N; C5H5NHCl (pKb for C5H5N is ...

Solved • Apr 15, 2020

Buffer

Q. Which solution will have the highest pH? The Ka of HClO is 3.8x10-3.a) A solution of 100 mL of water with 20 mL of 0.1 M NaOH added.b) A 100 mL buf...

Solved • Apr 15, 2020

Buffer

Q. How could you make a buffer? Select all that apply.a. Partially neutralize a weak base solution by addition of a strong acid.b. Add appropriate qua...

Solved • Apr 15, 2020

Buffer

Q. The Ka values for nitrous acid (HNO2) and hypochlorous (HClO) acid are 4.5×10−4 and 3.0×10−8, respectively.Part A:Which one would be more suitable ...

Solved • Apr 15, 2020

Buffer

Q. Select all that apply and explain:-The pH of a buffer solution is always 7.-The pH of a buffer solution depends on the pKa of the acid.-The pH of a...

Solved • Mar 30, 2020

Buffer

Q. What is the ratio of [A–]/[HA] at pH 5.75? The pKa of formic acid (methanoic acid, H–COOH) is 3.75.Draw the structure for formic acid.Draw the stru...

Solved • Mar 25, 2020

Buffer

Q. How much more acetic acid (pKa = 4.76) than acetate should be in solution to maintain a pH of 4.00?a) 2.13 times moreb) 5.75 times morec) 0.47 time...

Solved • Mar 20, 2020

Buffer

Q. Which of the following buffer systems would be the best choice to create a buffer with pH = 7.3?Part AAnswer: HClO/KClOFor the best system, calcula...

Solved • Mar 20, 2020

Buffer

Q. Which of the following mixtures may be act as a buffer solution?A) HBr, NaBrB) HF, NaFC) HCl, NaClD) HI, NaI

Solved • Mar 20, 2020

Buffer

Q. Which of the following would occur if solid NH4Cl was added to an aqueous solution of NH3? The pH decreases. The equilibrium constant changes. The ...

Solved • Mar 18, 2020

Buffer

Q. Which of the following are valid ways to make an ammonia/ammonium buffer for use in a laboratory? Explain your choices. a) Mix equal volumes of 1 M...

Solved • Mar 17, 2020

Buffer

Q. AcidKaCBKbH2CO34.2 x 10-7HCO3-2.4 x 10-8HCO3-4.8 x 10-11CO32-2.1 x 10-4You are to prepare a "carbonate" buffer with pH of 10.35. You are given carb...

Solved • Mar 13, 2020

Buffer

Q. Calculate the pH of a solution prepared by mixing 50 mL of a 0.10 M solution of HF with 25 mL of a 0.20 M solution of NaF. pKa of HF is 3.14.A) 5.8...

Solved • Feb 18, 2020

Buffer

Q. What is the pH of a solution that has an acetic acid concentration of 0.050 M and a sodium acetate concentration of 0.075 M?A 4.92B. 9.30C. 7.50D. ...

Solved • Feb 17, 2020

Buffer

Q. Which of the following statements regarding the Henderson-Hasselbalch (HH) equation are correct?I The HH equation is pH = pKa + log II The HH equat...

Solved • Feb 17, 2020

Buffer

Q. Which of the following statements regarding pH buffers are correct?I A pH buffer is an aqueous solution in which the pH changes less, upon adding a...

Solved • Feb 17, 2020

Buffer

Q. The capacity of a buffer is greatest when which of the following is true?A. [weak acid] > [its conjugate base]B. [weak acid] = [its conjugate ba...

Solved • Feb 10, 2020

Buffer

Q. Which of the following is a true statement about aqueous solutions containing a buffer?A. a buffer resists pH change caused by adding acid or baseB...

Solved • Feb 10, 2020

Buffer

Q. Given the following information:H3PO4              Ka1 = 7.5 x 10-3                      H2SO4                  Ka1 is large                       ...

Solved • Feb 10, 2020

Buffer

Q. Which of the following combinations would be a buffer?W. 1.0 mol NaCl + 1.0 mol HCl in 1.00 liter solutionX. 1.0 mol KNO3 + 1.0 mol HNO3 in 1.00 li...

Solved • Feb 7, 2020

Buffer

Q. What mass of sodium hypochlorite, NaOCl (molar mass 74.5 g/mol), must be added to 250 mL of 0.60 M HClO (hypochlorous acid, Ka = 3.5 x 10-8), in or...

Solved • Feb 7, 2020

Buffer

Q. Potassium fluoride (100 mL of a 0.4 M solution) was mixed with hydrofluoric acid (100 mL of a 0.4 M solution). What was the resulting pH? If 100 mL...

Solved • Feb 6, 2020

Buffer

Q. A buffer solution is prepared by mixing 150 mL of 0.100 M propionic acid (HC3H5O2, Ka = 1.3 x 10-5) and 400 mL of 0.0650 M potassium propionate. Wh...

Solved • Jan 27, 2020

Buffer

Q. A buffer that contains 0.13 M of an acid, HA and 0.33 M of its conjugate base A-, has a pH of 4.27. What is the pH after 0.012 mol of NaOH are adde...

Solved • Dec 19, 2019

Buffer

Q. A buffer solution is prepared that is 0.18 M NH3 and 0.27 M NH4Cl. What is the pH of this buffer? Kb for NH3 is 1.8 x 10 -5 A. 8.09B. 9.42C. 4.56D....

Solved • Dec 19, 2019

Buffer

Q. A buffer solution is prepared that is 0.24 M NH3 and 0.16 M NH4Cl. What is the pH of this buffer? Kb for NH3 is 1.8 x 10-5a. 10.22b. 9.43c. 8.78d. ...

Solved • Dec 19, 2019

Buffer

Q. Paracresol (C7H8OH) has a Ka = 5.5 x 10-11. If 100.0 mL of a 0.5000 M aqueous paracresol solution is mixed with 100.0 mL of 0.5000 M aqueous sodium...

Solved • Dec 18, 2019

Buffer

Q. Calculate the pH of a solution formed by mixing 100.0 mL of 0.100 M NaF and 100.0 mL of 0.060 M HCl. Ka of HF = 7.24 x 10-4.a. 2.96b. 4.68c. 3.32d....

Solved • Dec 18, 2019

Buffer

Q. What will happen if a small amount of hydrochloric acid is added to a 0.1 M ideal buffer based on NH3?a. The percent ionization of NH3 will increas...

Solved • Dec 18, 2019

Buffer

Q. The pH of 0.50 M HClO is 3.91. Calculate the change in pH when 1.68 g of NaClO (FW = 74.44 g/mol) is added to 47 mL of 0.50 M HClO (FW = 52.46 g/mo...

Solved • Dec 18, 2019

Buffer

Q. Calculate the pH of a solution that is 1.00 M HF and 0.20 M KF. Ka = 7.24 x 10-4a. 2.44b. 3.84c. 0.70d. 3.14e. 2.84

Solved • Dec 18, 2019

Buffer

Q. What will happen is a small amount of hydrochloric acid is added to a 0.1 M ideal buffer based on HF?a. The percent ionization of HF will increase....

Solved • Dec 17, 2019

Buffer

Q. Calculate the pH when 1.11 g of CH3COONa (FW = 82.03 g/mol) is added to 41 mL of 0.500 M acetic acid, CH3COOH. Ignore any changes in volume. The Ka...

Solved • Dec 17, 2019

Buffer

Q. Calculate the pH of a solution that is 0.242 M C6H5COOH and 0.183 M C6H5COONa. Ka of C6H5COOH is 6.5 x 10-5.a. 2.77b. 5.81c. 4.31d. 4.07e. 6.19

Solved • Dec 17, 2019

Buffer

Q. Calculate the pH when 0.98 g of CH3COONa (FW = 82.03 g/mol) is added to 38 mL of 0.500 M acetic acid, CH3COOH. Ignore any changes in volume. The Ka...

Solved • Dec 12, 2019

Buffer

Q. Calculate the pH of a solution that is 0.111 M CH3COOH and 0.558 M CH3COONa. Ka of CH3COOH is 1.8 x 10-5.a. 5.45b. 5.02c. 5.67d. 6.91e. 6.82

Solved • Dec 12, 2019

Buffer

Q. What will happen if a small amount of hydrochloric acid is added to a 0.1 M ideal buffer based on HF?

Solved • Dec 12, 2019

Buffer

Q. The pH of 0.50 M HClO is 3.91.  Calculate the change in pH when 1.68 g of NaClO (FW = 74.44 g/mol) is added to 31 mL of 0.50 M HClO (FW = 52.46 g/m...

Solved • Dec 12, 2019

Buffer

Q. Calculate the pH of a solution that is 0.559 M HBrO and 0.14 M NaBrO.Ka of HBrO is 2.0 x 10-9.

Solved • Dec 12, 2019

Buffer

Q. A solution with a volume of 1.00 L is 0.450 M in CH3COOH(aq) and 0.350 M in CH3COONa(aq). What will the pH be after 0.0800 mol of HCl is added to t...

Solved • Nov 12, 2019

Buffer

Q. What substance would you add to NaHCO3(aq) to form a buffer solution?

Solved • Sep 3, 2019

Buffer

Q. Which of the following aqueous solutions are good buffer systems? [YOU CAN PICK MORE THAN ONE]0.36 M calcium perchlorate + 0.20 M potassium perchlo...

Solved • Aug 29, 2019

Buffer

Q. Which of the following aqueous solutions are good buffer systems? [YOU CAN PICK MORE THAN ONE]0.19 M barium hydroxide + 0.29 M barium bromide0.28 M...

Solved • Aug 29, 2019

Buffer

Q. Which of the following aqueous solutions are good buffer systems? [YOU CAN PICK MORE THAN ONE]0.31 M ammonium bromide + 0.32 M ammonia0.21 M hypoch...

Solved • Aug 29, 2019

Buffer

Q. CH3COOH + H2O ⇌Calculate the pH of a solution that is 1.00 M CH 3COOH (Ka = 1.8 x 10 -5) and 1.00 M CH 3COONa.

Solved • Aug 25, 2019

Buffer

Q. What is the pH of a buffer solution that is 0.24 M NH 3 and 0.20 M NH4Cl?

Solved • Aug 25, 2019

Buffer

Q. How do you calculate the change in pH when 3.00 mL of 0.100 M   HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0....

Solved • Aug 7, 2019

Buffer

Q. A 1.50 L buffer solution is 0.250 M HF and 0.250 M NaF. What is the pH of the solution after the addition of 0.0500 moles of solid NaOH? Assume no ...

Solved • Aug 7, 2019

Buffer

Q. You need to prepare 100.0mL of a pH = 4.00 buffer solution using 0.100 M benzoic acid (pKa = 4.20) and 0.240 M sodium benzoate. How much of each so...

Solved • Aug 7, 2019

Buffer

Q. Using the equation pH = pKa + log{ [A-] / [HA] } and the graph, provide an estimate of the pKa of the acid using data from points A, B, and C. Repo...

Solved • Aug 6, 2019

Buffer

Q. What would be the pH of a buffer that is 1.5 M in H 2CO3 and 1.0 M in NaHCO3?

Solved • Aug 5, 2019

Buffer

Q. How much more acetic acid (pKa = 4.76) than acetate should be in solution to maintain a pH of 4.00?a. 2.13 times moreb. 5.75 times morec. 0.47 time...

Solved • Jul 10, 2019

Buffer

Q. Part A. 75.0 mL of 0.10 M HF; 55.0 mL of 0.15 M NaFa. this will be a bufferb. this will not be a bufferPart B. 150.0 mL of 0.10 M HF; 135.0 mL of 0...

Solved • Jul 10, 2019

Buffer

Q. During exercise when the body lacks an adequate supply of oxygen to support energy production, the pyruvate that is produced from the breakdown of ...

Solved • Jul 10, 2019

Buffer

Q. What is the pH of a buffer that is 0.6 M HF and 0.2 M NaF? The Ka of HF is 6.8 × 10−4.a. 3.65b. 2.69c. 3.17d. 3.50

Solved • Jul 9, 2019

Buffer

Q. H2CO3 is a diprotic acid. The pKa for H2CO3 is 6.35, and the pKa for HCO3- is 10.33. At pH = 7.2 what is the "approximate" relative quantities of H...

Solved • Jul 9, 2019

Buffer

Q. Acetic acid has a pKa of 4.74. A sodium acetate/ acetic acid buffer (CH3CO2Na / CH3CO2H) with a pH of 4.74 can be made by:a. Combining 0.10 mole of...

Solved • Jul 9, 2019

Buffer

Q. Calculate the number of grams of ammonium chloride that must be added to 2.00 L of a 0.500 M ammonia solution to obtain a buffer of pH = 9.20. Assu...

Solved • Jan 3, 2019

Buffer

Q. A biochemist needs 750 mL of an acetic acid-sodium acetate buffer with exttip{pH}{pH} = 4.55. Solid sodium acetate (CH3 COONa) and glacial acetic...

Solved • Jan 3, 2019

Buffer

Q. You are asked to prepare a pH = 3.00 buffer solution starting from 1.25 L of a 1.00 M solution of hydrofluoric acid (HF) and an excess of sodium fl...

Solved • Jan 3, 2019

Buffer

Q. You are asked to prepare a pH = 3.00 buffer solution starting from 1.25 L of a 1.00 M solution of hydrofluoric acid (HF) and an excess of sodium fl...

Solved • Jan 3, 2019

Buffer

Q. A buffer contains 0.16 mol of propionic acid (C2H5COOH) and 0.22 mol of sodium propionate (C2H5COONa) in 1.20 L.What is the pH of the buffer after ...

Solved • Jan 3, 2019

Buffer

Q. You have to prepare a pH 5.05 buffer, and you have the following 0.10M solutions available: HCOOH, HCOONa, CH3COOH, CH3COONa, HCN, and NaCN.Which s...

Solved • Jan 3, 2019

Buffer

Q. You have to prepare a pH 5.05 buffer, and you have the following 0.10M solutions available: HCOOH, HCOONa, CH3COOH, CH3COONa, HCN, and NaCN.How man...

Solved • Jan 3, 2019

Buffer

Q. Calculate the pH of a solution formed by mixing 65 mL of a solution that is 0.26 M in NaHCO3 with 75 mL of a solution that is 0.21 M in Na2CO3.

Solved • Jan 3, 2019

Buffer

Q. A buffer solution contains 0.11 mol of acetic acid and 0.14 mol of sodium acetate in 1.00 L.What is the pH of this buffer?

Solved • Jan 3, 2019

Buffer

Q. A buffer solution contains 0.11 mol of acetic acid and 0.14 mol of sodium acetate in 1.00 L.What is the pH of the buffer after the addition of 0.03...

Solved • Jan 3, 2019

Buffer

Q. A buffer solution contains 0.11 mol of acetic acid and 0.14 mol of sodium acetate in 1.00 L.What is the pH of the buffer after the addition of 0.03...

Solved • Jan 3, 2019

Buffer

Q. What is the ratio of HCO3- to H2CO3 in blood of pH 7.4?

Solved • Jan 3, 2019

Buffer

Q. What is the ratio of HCO3- to H2 CO3 in an exhausted marathon runner whose blood pH is 7.2?

Solved • Jan 3, 2019

Buffer

Q. A buffer, consisting of H2PO4- and HPO42-, helps control the pH of physiological fluids. Many carbonated soft drinks also use this buffer system.Wh...

Solved • Jan 3, 2019

Buffer

Q. You have to prepare a pH 3.60 buffer, and you have the following 0.10 M solutions available: HCOOH, CH3COOH, H3PO4, HCOONa, CH3COONa, and NaH2PO4.W...

Solved • Jan 3, 2019

Buffer

Q. You have to prepare a pH 3.60 buffer, and you have the following 0.10 M solutions available: HCOOH, CH3COOH, H3PO4, HCOONa, CH3COONa, and NaH2PO4.H...

Solved • Jan 3, 2019

Buffer

Q. Calculate the percent ionization of 0.130 M lactic acid in a solution containing 8.0×10−3  M sodium lactate.

Solved • Jan 3, 2019

Buffer

Q. If solutions of NH4Cl(aq) and NH3(aq) are mixed, which ions in the resulting solution are spectator ions in any acid-base chemistry occurring in th...

Solved • Jan 3, 2019

Buffer

Q. Use information from Appendix D in the textbook to calculate the pH of the following solutions.Calculate the pH of a solution that is 0.260 M in so...

Solved • Jan 3, 2019

Buffer

Q. Calculate the pH of a buffer that is 0.13 M in lactic acid and 0.11 M in sodium lactate.

Solved • Jan 3, 2019

Buffer

Q. Calculate the pH of a buffer formed by mixing 85 mL of 0.13 M lactic acid with 95 mL of 0.16 M sodium lactate.

Solved • Jan 3, 2019

Buffer

Q. Use information from Appendix D in the textbook to calculate the pH of the following solutions.Calculate the pH of a solution that is 0.080 M in tr...

Solved • Jan 3, 2019

Buffer

Q. Consider a buffer solution that is 0.50 M in NH3 and 0.20 M in NH4Cl. For ammonia, pKb= 4.75. Calculate the pH of 1.0 L upon addition of 0.110 mol ...

Solved • Jan 3, 2019

Buffer

Q. Calculate the pH of a buffer solution that is 0.251 M in HCN and 0.170 M in KCN. For HCN, Ka = 4.9×10−10 (pKa = 9.31).

Solved • Jan 3, 2019

Buffer

Q. Calculate the pH of the solution that results from each of the following mixtures: 160.0 mL of 0.26 M HF with 230.0 mL of 0.32 M  NaF

Solved • Jan 3, 2019