Question

Which one of the following electrolytes would dissolve in water to give an alkaline solution?

• A. $C{H}_{3}COOH$
• B. $C{H}_{3}COONa$
• C. $N{H}_{4}Cl$
• D. $HCN$

Answer 1

Answer: (B)

$C{H}_{3}COONa$ will give an alkaline solution on dissolving in water because it is a salt of strong base and weak acid. $C{H}_{3}COONa+H_{2}O\rightleftharpoons \underset{\begin{array}{c}highly\\ ionised\end{array}}{\mathrm{NaOH}}+\underset{\begin{array}{c}feebly\\ ionised\end{array}}{C{H}_{3}COOH}$ So, in solution the concentration of $O{H}^{-}$ ion is higher than $H^{+}$ concentration. Hence, aqueous solution of $C{H}_{3}COONa$ is alkaline.