Question
What is meant by hydrolysis ? A solution of CH3COONH4 is neutral. why ?
✓
Answer
Hydrolysis: A reaction in which the cations or anions or both the ions of a salt react with water to produce acidity or basicity or sometimes neutrality is called hydrolysis.
A salt of weak acid and weak base for which $K _{ a }= K _{ b }$ :
Consider hydrolysis of $CH _3 COONH _4$.
$
CH _3 COO _{( aq )}^{-}+ NH _{4( aq )}^{+} \rightleftharpoons \underset{\text { weak acid }}{ CH _3 COOH _{( aq )}}+\underset{\text { weak acid }}{ NH_4OH{( aq )}}$
Since $K _{ a }= K _{ b }$, the weak acid $CH _3 COOH$ and weak base $NH _4 OH$ dissociate to the same extent, hence, $\left[ H _3 O ^{+}\right]=\left[ OH ^{-}\right]$and the solution reacts neutral after hydrolysis.
A salt of weak acid and weak base for which $K _{ a }= K _{ b }$ :
Consider hydrolysis of $CH _3 COONH _4$.
$
CH _3 COO _{( aq )}^{-}+ NH _{4( aq )}^{+} \rightleftharpoons \underset{\text { weak acid }}{ CH _3 COOH _{( aq )}}+\underset{\text { weak acid }}{ NH_4OH{( aq )}}$
Since $K _{ a }= K _{ b }$, the weak acid $CH _3 COOH$ and weak base $NH _4 OH$ dissociate to the same extent, hence, $\left[ H _3 O ^{+}\right]=\left[ OH ^{-}\right]$and the solution reacts neutral after hydrolysis.
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