Question

Hx is a weak acid and forms salt nax on reacting with caustic soda. the hydrolysis constant of salt is

Answer 1

Anionic hydrolysis

It is a hydrolysis reaction in which hydrolysis of the salt of a weak acid takes place.This reaction takes place when salt of a strong base and weak acid is dissolved in water.

For example :- Let HB be the weak acid, here hydrolysis of $B^{-}$ takes place.

• Since, it is an anion, it Is named as anionic hydrolysis.

The reaction that takes place is :-

${B}^{ - } + H_{2}(O) = > BH \: + O {H}^{ - }$

• We observe that the solution is alkaline.

Here, hydrolysis constant ($k_{h}$ ) = $\frac{ \: \: k_{w}\: }{ k_{a}}$

where $k_{a}$ = dissociation constant of the acid.