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A physician wishes to prepare a buffer s...

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

A

m-chlorobenzoic acid `(pK_(a)=3.98)`

B

p-chlorocinnamic acid `(pK_(a)=4.41)`

C

2,5-dihydroxybenzoic acid `(pK_(a)= 2.97)`

D

acetoacetic acid `(pK_(a)=3.58)`

Text Solution

Verified by Experts

The correct Answer is:
D
`pH=pK_(a)+log""(["salt"])/(["acid"])`
For small concentration of buffering agent and for maximum buffer capacity `(["salt"])/(["acid"])~=1`
`:.pH=pK_(a)`
`:.pK_(a)=3.58`, thus at this state pH=3.58
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