Which among the following salt solution in water is acidic in nature?
Which among the following salt solution in water is acidic in nature?
$\mathrm{CuCl}_2$
$\mathrm{NH}_4 \mathrm{CN}$
$\mathrm{KCN}$
$\mathrm{CH}_3 \mathrm{COONa}$
Solution
(1) $\mathrm{CuCl}_2$ : Salt of strong acid and weak base: Solution is acidic.
(2) $\mathrm{NH}_4 \mathrm{CN}$ : Salt of weak acid and weak base for which $\mathrm{K}_{\mathrm{a}} < \mathrm{K}_{\mathrm{b}}$ : Solution is basic.
(3) $\mathrm{KCN}$ : Salt of weak acid and strong base: Solution is basic.
(4) $\mathrm{CH}_3 \mathrm{COONa}$ : Salt of weak acid and strong base: Solution is basic.