In which of the following salts, only cationic hydrolysis is involved?
In which of the following salts, only cationic hydrolysis is involved?
$\mathrm{CH}_3 \mathrm{COONH}_4$
$\mathrm{CH}_3 \mathrm{COONa}$
$\mathrm{NH}_4 \mathrm{Cl}$
$\mathrm{Na}_2 \mathrm{SO}_4$
Solution
Dissolution $\mathrm{NH}_4 \mathrm{Cl} ightarrow \mathrm{NH}_4^{+}+\mathrm{Cl}^{-}$
$\mathrm{Cl}^{-}$will form $\mathrm{Cl}^{-}$(aq) and will not undergo hydrolysis.
Hydrolysis $\mathrm{NH}_4^{-}+\mathrm{H}_2 \mathrm{O} ightleftharpoons \mathrm{NH}_3+\mathrm{H}_3 \mathrm{O}^{+}$
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