You are asked to make a buffer to a pH of 4.00 and you have the following acids to do it with (pKa in parentheses): chloroacetic (2.85), nitrous (3.16), lactic (3.86), acetic (4.75), and propionic (4.87). Which acid (and its conjugate base) would be the best choice and why?

General, Organic, and Biological Chemistry
7th Edition
ISBN:9781285853918
Author:H. Stephen Stoker
Publisher:H. Stephen Stoker
Chapter10: Acids, Bases, And Salts
Section: Chapter Questions
Problem 10.125EP: What is the pH of a buffer that is 0.150 M in a weak acid and 0.150 M in the acids conjugate base?...
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You are asked to make a buffer to a pH of 4.00 and you have the following acids to do it with (pKa in parentheses): chloroacetic (2.85), nitrous (3.16), lactic (3.86), acetic (4.75), and propionic (4.87). Which acid (and its conjugate base) would be the best choice and why? 

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