Question
Explain common in effect.
Solution
Common ion effect defined as the suppression of the degree of dissociation of weak electrolyte (weak acid or weak base) by the addition of strong electrolyte containing common ion.Let us consider the ionisation of weak base.
If solid NH4Cl is added to the solution, the concentration of NH4+ ions increases. According to Le-Chatelier’s principle, the equilibrium shifts to the left. As a result, the concentration of O– ion decreases and the weak base NH4OH becomes even weaker in the presence of its salt.
This phenomenon is called common ion effect.
If solid NH4Cl is added to the solution, the concentration of NH4+ ions increases. According to Le-Chatelier’s principle, the equilibrium shifts to the left. As a result, the concentration of O– ion decreases and the weak base NH4OH becomes even weaker in the presence of its salt.
This phenomenon is called common ion effect.
