Question

Which one is an acidic salt?

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

Answer 1

The correct option is A

$N{H}_{4}Cl$

Salts of a strong acid and a strong base are neutral with pH value of 7. On the other hand, salts of a strong acid and weak base are acidic with pH value less than 7 and those of a strong base and weak acid are basic in nature, with pH value more than 7.
$\bullet$ $N{H}_{4}Cl$ is a salt of weak base $\left(N{H}_{4}OH\right)$ and strong acid $\left(HCl\right)$. Hence, it is a acidic salt.
$\bullet$ $C{H}_{3}COONa$ is salt of weak acid $\left(C{H}_{3}COOH\right)$ and strong base $\left(NaOH\right)$. Hence, it is a basic salt.
$\bullet$ $KCl$ is salt of strong acid $\left(HCl\right)$ and strong base $\left(KOH\right)$. Hence, it is a neutral salt.
$\bullet$ $NaCl$ is salt of strong acid $\left(HCl\right)$ and strong base $\left(NaOH\right)$. Hence, it is a neutral salt.