HX is a weak acid ( Ka = 10 - 5 ).lt forms a salt NaX (0.1 M) on reacting with caustic soda. The degree of hydrolysis of Na X is

Question

HX is a weak acid ( Ka = 10 - 5 ).lt forms a salt NaX (0.1 M) on reacting with caustic soda. The degree of hydrolysis of Na X is (A) 0.01 % (B) 0.0001% (C) 0.1% (D) 0.5%

Tardigrade Admin · Accepted Answer

Kh ( X - ) = ( Kw / Ka ) = ( 10 - 1 4 / 10 - 5 ) = 10 - 9 α = √ ( Kh / C ) = √ ( 10 - 9 / 0.10 ) = 10 - 4 % hydrolysis = 100 α =0.01

Q. $H X$ is a weak acid ( $K_{a} = 1 0^{- 5}$ ).lt forms a salt $N a X (0.1 M)$ on reacting with caustic soda. The degree of hydrolysis of $N a X$ is

0.01 %

0.0001%

0.1%

0.5%

$K_{h} (X^{-}) = \frac{K _{w}}{K _{a}} = \frac{1 0 ^{- 14}}{1 0 ^{- 5}} = 1 0^{- 9}$
$α = \frac{K _{h}}{C} = \frac{1 0 ^{- 9}}{0.10} = 1 0^{- 4}$
$%$ hydrolysis $= 100 α = 0.01$

Q. HX is a weak acid ( Ka​=10−5 ).lt forms a salt NaX(0.1M) on reacting with caustic soda. The degree of hydrolysis of NaX is