Question

Formula for calculating degree of hydrolysis when hydrolysis constant os not small

Answer 1

Answer:

A hydrolysis constant is an equilibrium constant for a hydrolysis reaction.[1]

For example, if a metal salt such as AlCl3 dissolves in an aqueous solution, the metal cation behaves as a Lewis acid and hydrolyzes the water molecules in the solvent.[2]

Al3+ + 2H2O → AlOH2+ + H3O+

The hydrolysis constant for this reaction is as shown:

Khydrolysis = [H3O+] * [AlOH2+] / [Al3+]

In a more generalized form, the hydrolysis constant can be described as:

Ka = [H3O+] * [A−] / [HA]