At infinite dilution, when dissociation is complete each ion makes a definite contribution towards molar conductance of the electrolyte irrespective of the nature of the other ion with which it is associated and that the molar conductance of any electrolyte at infinite dilution is given by the sum of the contributions of two ions. This is called Kohlrausch’s law. Λm∞=λ+∞+λ−∞ λ+∞ and λ−∞ are molar ionic conductance at infinite dilution for cations and anion respectively.