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Salt of Weak Acid and Strong Base

A physician w...

Question

A physician wishes to prepare a buffer solution at pH = 3.58 that efficiently resists a change in pH yet contains only small conc. of the buffering agents. Which one of the following weak acid together with its sodium salt would be best to use?

m-chloro benzoic acid ( pK_a =3.98)

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p-chlorocinnamic acid (pK_a = 4.41)

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2,5 - dihydroxy benzoic acid (pK_a = 2.97)

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Acetoacetic acid (pK_a = 3.58)

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Solution

The correct option is D Acetoacetic acid (pK_a = 3.58)
A buffer solution is more effective in the pH range of pK_a ± 1.

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