Degree of dissociation is defined as the ratio of number of molecules dissociated as ions to total number of molecules of electrolyte dissolved.
Degree of association of strong electrolytes is unity(1). But,for weak electrolytes is less than Unity.
The extent of dissociation for weak electrolytes increases upon the dilution.
A 0.01 M ammonia solution is 5% ionized, the concentration of OH⁻ ions is 1) 0.005 M 2) 0.0001 M 3) 0.0005 M 4) 0.05 M