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Q.

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?

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a

m-chloro benzoic acid (pKa = 3.98)

b

p - chlorocinnamic acid (pKa = 4.41)

c

2.5 - dihydroxy benzoic acid (pKa = 2.97)

d

Acetoacetic acid (pKa = 3.58)

answer is D.

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Detailed Solution

Given that the buffer solution contains only small concentraiton of buffering agents
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