1.

What is common ion?

Answer»

Common ion : An ion common to two electrolytes is called common ion. This is generally applicable to a mixture of a strong and a weak electrolyte. 

For example,

A solution containing weak electrolyte CH3COOH and strong electrolyte salt CH3COONa. 

CH3COONa → CH3COO- + Na+; 

CH3COOH ⇌ CH3COO- + H+ 

Hence,

CH3COOH and CH3COONa have a common ion CH3COO-.


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