Question

Aqueous solution of $HN{O}_3$, $KOH,C{H}_{3}COOH$ and $C{H}_{3}COONa$ of identical cocenteration are provided. The pair (s) of solution which forms buffer upon mixing is (are)

• A. $HN{O}_3$ and $C{H}_{3}COOH$
• B. $KOHandC{H}_{3}COONa$
• C. $HN{O}_3$ and $C{H}_{3}COONa$
• D. $C{H}_{3}COOHandC{H}_{3}COONa$

Answer 1

The correct option is D $C{H}_{3}COOHandC{H}_{3}COONa$

A buffer solution is an aqueous solution consisting of a mixture of a weak acid and its conjugate base or a weak base and its conjugate acid,
of all options, only in option d there is a pair of a weak acid $\left(C{H}_{3}COOH\right)$ and salt of its conjugate base$\left(C{H}_{3}COONa\right)$ .
Hence, $C{H}_{3}COOHandC{H}_{3}COONa$ are buffer solution.