Question: A chemist needs to prepare a solution buffered at pH 4.30 using one of the following acids (and its sodium salt): Calculate the ratio of

A chemist needs to prepare a solution buffered at pH 4.30 using one of the following acids (and its sodium salt):

a. chloroacetic acid (K = 1.35 x 10-) b. propanoic acid (K = 1.3 x 10-5) c. benzoic acid (K = 6.4 x 10-5) d.

Calculate the ratio of [HA]/[A–] required for each system to yield a pH of 4.30. Which system will work best?

a. chloroacetic acid (K = 1.35 x 10-) b. propanoic acid (K = 1.3 x 10-5) c. benzoic acid (K = 6.4 x 10-5) d. hypochlorous acid (K = 3.5 10-8)

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