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To prepare aqueous buffer solution of p...

To prepare aqueous buffer solution of pH = `2.85` that efficiently resists a changee in pH yet contains only a small amount of buffering agent , Which one of the following weak acid together with its salt would be best to use ?

A

m - chlorobenzoic acid `( p K_(a) = 3.98)`

B

p-chloro cinnamic acid `( pK_(a) = 4.41)`

C

2,5-dihydroxy benzoic acid `( p K_(a) = 2.97)`

D

Acetoacetic acid `( p K_(a) = 3.58)`

Text Solution

Verified by Experts

The correct Answer is:
C
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