Which of the following mixtures in water acts as an acidic buffer?

A $HCl$ and $NaCl$
B $CH X_{3} COOH$ and $CH X_{3} COONa$
C $NaOH$ and $NaCl$
D $HNO X_{3}$ and $KNO X_{3}$

Answer: B

An acidic buffer is a weak acid together with its conjugate base (its salt with a strong base). Only acetic acid with sodium acetate fits; the others pair a strong acid or strong base with a neutral salt.

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