The degree of hydrolysis of a salt of weak acid and strong base is $$\approx0.5$$. The equation to be used to calculate the accurate value of the degree of hydrolysis $$(h)$$ is
A
$$h=\sqrt {\dfrac {K_w}{K_a . C}}$$
B
$$h=\sqrt {\dfrac {K_w}{K_b . C}}$$
C
$$h=\sqrt {\dfrac {K_w}{K_a . K_b}}$$
Correct option is B. $$h=\sqrt {\dfrac {K_w}{K_a . C}}$$