First slide

Group 14 or carbon family

Question

Whose aqueous solution is not acidic?

Difficult

A

$N a H S O_{4}$
B

$N a H C O_{3}$
C

$H_{3} P O_{2}$
D

Both (2) & (3)

Solution

$N a H C O_{3}$ is a salt of strong base and weak acid. It will have a basic solution.
Alternatively, $H C {O_{3}}^{-}$ ion is an amphiprotic substance. The pH of such a solution is the average of ${(p K_{a})}_{1}$ and ${(p K_{a})}_{2}$ .
$p H = \frac{{(p K_{a})}_{1} + {(p K_{a})}_{2}}{2} = \frac{6.77 + 9.33}{2} = 8.05$

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