For a strong electrolyte, equivalent conductance Increases slowly with dilution and can be expressed by the relationship; ${\wedge }_m={\wedge }_m^o-A\sqrt{C}$which electrolyte (S) have same value of ‘A’

‘A’ depends on the type (Magnitude of charge on cation and anion) of electrolyte for a given temperature of solvent

Electrolyte                           Type

$\text{NaCl}$                                  1, -1

${\text{CaCl}}_{\text{2}}$                                 2, -1     Same type

${\text{ZnCl}}_{\text{2}}$                                  2, -1     same type

${\text{MgSO}}_{\text{4}}$                               2, -2