A chemist needs a solution buffered at pH 4.30 and can choose from the following acids: A. Chloroacetic acid (Ka = 1.35 x 10-3) B. Propanoic acid (Ka = 1.30 x 10-5) C. Benzoic acid (Ka = 6.40 x 10-5) D. Hypochlorous acid (Ka = 3.50 x 10-8) Which of the following will be best suited to make the buffer? Show calculations to support your answer.

A chemist needs a solution buffered at pH 4.30 and can choose from the following acids: A. Chloroacetic acid (Ka = 1.35 x 10-3) B. Propanoic acid (Ka = 1.30 x 10-5) C. Benzoic acid (Ka = 6.40 x 10-5) D. Hypochlorous acid (Ka = 3.50 x 10-8) Which of the following will be best suited to make the buffer? Show calculations to support your answer.

General Chemistry - Standalone book (MindTap Course List)

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ISBN:9781305580343

Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell

Publisher:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell

Chapter16: Acid-base Equilibria

Section: Chapter Questions

Problem 16.16QP: If the pH is 8.0 at the equivalence point for the titration of a certain weak acid with sodium...

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Design a buffer that has a pH of 10.20 using one of the weak base/conjugate acid systems shown below. Weak Base Kb Conjugate Acid Ka pKa CH3NH2 4.2×10-4 CH3NH3+ 2.4×10-11 10.62 C6H15O3N 5.9×10-7 C6H15O3NH+ 1.7×10-8 7.77 C5H5N 1.5×10-9 C5H5NH+ 6.7×10-6 5.17 How many grams of the chloride salt of the conjugate acid must be combined with how many grams of the weak base, to produce 1.00 L of a buffer that is 1.00 M in the weak base? grams chloride salt of conjugate acid = grams weak base =
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Design a buffer that has a pH of 8.21 using one of the weak base/conjugate acid systems shown below. Weak Base Kb Conjugate Acid Ka pKa CH3NH2 4.2×10-4 CH3NH3+ 2.4×10-11 10.62 C6H15O3N 5.9×10-7 C6H15O3NH+ 1.7×10-8 7.77 C5H5N 1.5×10-9 C5H5NH+ 6.7×10-6 5.17 How many grams of the bromide salt of the conjugate acid must be combined with how many grams of the weak base, to produce 1.00 L of a buffer that is 1.00 M in the weak base? grams bromide salt of conjugate acid = grams weak base =
1. Which of the following solution(s) would be a buffer? Select all that apply. A 100.0 mL of a solution that contains 0.100 M benzoic acid and 0.100 M potassium benzoate B 100.0 mL of a 0.100 M formic acid solution C 100.0 mL of a solution that contains 0.100 M hydrochloric acid and 0.100 M sodium chloride D 100.0 mL of a 0.100 M solution of acetic acid in which 0.100 g of sodium acetate is dissolved E 100.0 mL of a 0.100 M propanoic acid to which 50.0 mL of 0.100 M sodium hydroxide has been added
select correct statements only 1) Buffered systems exist in equilibrium. 2) In an acid-base reaction, the acid is represented by (OH-). 3) Ka values are derived from aqueous molar concentrations [H+], [A-}, and [HA]. 4) For a weak acid HA, the conjugate base is A- . 5) Ka values are often large in magnitude, so pKa is often instead used. 6)The sum of [HA] and [A-] must always be equal to 1. 7) When formulating a given buffer solution, the volume of weak acid and the volume of conjugate base that must be added will always be equal. 8) The Henderson-Hasselbalch Equation can be used to calculate the amount of weak acid and conjugate base required to build a pH-specific buffer. 9) In the Henderson-Hasselbalch Equation, the logarithmic function used is log base 10. 10) The two multiplicative factors FHA and FA- sum to 0.
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