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Degree of ionization is expressed as a. For, strong electrolytes, a=1. Examples include, HCl, HNO3, NaCl, KOH etc. As for weak, electrolytes a<x<1. Examples include HCN,, CH3COOH, H20. Strong electrolyte with a, common ion decreases the degree of, ionization., , No.of dissociated molecules, Total no.of molecules of electrolytebefore dissociation, , , , Degree of ionization= a =