Q 2486312277.     A chemist wishes to prepare a buffer
solution of `pH= 2.90` that efficiently resists a
change in `pH` yet contains only small
concentration of buffering agents. Which
one of the following weak acid along with its
salt would be best to use

UPSEE 2013
A

`m`-chlorobenzoic acid `(pK_a = 3.98)`

B

Acetoacetic acid `(pK_a = 3 58)`

C

`2,5`-dihydrobengoic acid `(pK_a = 2.97)`

D

`p`-clllorocimanic acid `(pK_a = 4.41)`

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