Question

Which one of the following is an acidic salt?

• A. ${Na}_2{CO}_3$
• B. $NaH{CO}_3$
• C. ${NH}_{4}Cl$
• D. $NaCl$

Answer 1

The correct option is C ${NH}_{4}Cl$

Acidic salt is a salt of strong acid and weak base.

$\left(A\right)$ $N{a}_{2}C{O}_3⟶\underset{Strongbase}{\underset{}{NaOH}}+\underset{Weakacid}{\underset{}{H_{2}C{O}_3}}$ (Basic)

$\left(B\right)$ $NaHC{O}_3⟶\underset{Strongbase}{\underset{}{NaOH}}+\underset{Weakacid}{\underset{}{H_{2}C{O}_3}}$ (Basic)

$\left(C\right)$ $N{H}_{4}Cl⟶\underset{Weakbase}{\underset{}{N{H}_{4}OH}}+\underset{Strongacid}{\underset{}{HCl}}$ (Acidic)

$\left(D\right)$ $NaCl⟶\underset{Strongbase}{\underset{}{NaOH}}+\underset{Strongacid}{\underset{}{HCl}}$ (Neutral)

Thus $N{H}_{4}Cl$ is an acidic salt.