Question
Why: (i) an aqueous solution of $NH_4Cl$ is acidic.
(ii) while that of $HCOOK$ basic ?
(ii) while that of $HCOOK$ basic ?
✓
Answer
(i). (i) Ammonium chloride is a salt of strong acid and weak base.
(ii) In aqueous solution it undergoes hydrolysis
(iii) Since $[H^+]$ or $[H_3O^+] > [OH^–]$ the solution is acidic.
(ii). $HCOOK$ is a salt of weak acid $HCOOH$ and strong base $KOH$. In aqueous solution it undergoes hydrolysis giving weak acid and strong base KOH which dissociates completely,
$\therefore [OH^–] > [H_3O^+]$, and the solution reacts basic.
(ii) In aqueous solution it undergoes hydrolysis
(iii) Since $[H^+]$ or $[H_3O^+] > [OH^–]$ the solution is acidic.
(ii). $HCOOK$ is a salt of weak acid $HCOOH$ and strong base $KOH$. In aqueous solution it undergoes hydrolysis giving weak acid and strong base KOH which dissociates completely,
$\therefore [OH^–] > [H_3O^+]$, and the solution reacts basic.
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