1.

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

Answer»

<P>m - chlorobenzoic acid `( p K_(a) = 3.98)`
p-chloro cinnamic acid `( pK_(a) = 4.41)`
2,5-dihydroxy BENZOIC acid `( p K_(a) = 2.97)`
Acetoacetic acid `( p K_(a) = 3.58)`

Answer :C


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