Q.
How many of the following salt(s) form basic solution when dissolved in water?
$\left( NH _{4}\right)_{2} SO _{4}, KCl , CH _{3} COONa , FeCl _{3}, NaBr$, $BaCl _{2}$.
Equilibrium
Solution:
Salts of weak acid and strong base give basic solution $( pH >7)$.
Salts of weak acid and weak base gives basic solution, if $K _{ b } > K _{ a }$.
$\left( NH _{4}\right)_{2} SO _{4}$
Strong acid
Weak base
$KCl$
Strong acid
Strong base
$CH _{3} COONa$
Weak acid
Strong base
$FeCl _{3}$
Strong acid
Weak base
$NaBr$
Strong acid
Strong base
$BaCl_2$
Strong acid
Strong base
Only $CH _{3} COONa$ forms basic solution when dissolved in water.
| $\left( NH _{4}\right)_{2} SO _{4}$ | Strong acid | Weak base |
| $KCl$ | Strong acid | Strong base |
| $CH _{3} COONa$ | Weak acid | Strong base |
| $FeCl _{3}$ | Strong acid | Weak base |
| $NaBr$ | Strong acid | Strong base |
| $BaCl_2$ | Strong acid | Strong base |