Question

How is the ionization of NH₄OH suppressed by addition of NH₄Cl to the solution of NH₄OH ?

Answer 1

Ionisation of NH₄OH is represented as follows :

It has ionisation constant,

K_b has constant value at constant temperature. When strong electrolyte NH₄Cl is added to its solution, it dissociates completely.

Due to common ion \(NH_4^{-}\), by Le Chatelier’s principle, the equilibrium is shifted from right to left, suppressing the ionisation of NH₄OH.