First slide

Salt hydrolysis :

Question

MX is the salt of weak base, MOH and weak acid, HX. Aqueous solution of MX is

Easy

A

Acidic, if K_a < K_b
B

Basic, if K_a> K_b
C

Neutral, if K_a = K_b
D

All the above

Solution

P^H of an Aqueous solution of a salt of weak acid and weak base is given by
$\large {P^H} = \frac{1}{2} [{{P^{{K_w}}}+{P^{{K_a}}}-{P^{{K_b}}}]$
if Ka = K_b ⇒ $\large {{P^{{K_a}}}}={{P^{{K_b}}}}$
OR
$\large {P^H} = \frac{1}{2} {{P^{{K_w}}}=7$
at 25^oC

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