Kohlrausch’s Law

At infinite dilution an ionic specie (cation or anion) contributes a fixed value, at a given temperature, towards equivalent conductance of the electrolyte irrespective of the other ionic species in combination with it. There contributions are known as equivalent ionic conductance at 8 dilution defined by ?c0 and ?a0 for cation and anion respectively.

Mathematically, shown in the figure :

+x?B-8 and +y?B-8 are the major conductance of A+ and B– at infinite dilution x and y are the ions provided by one formula unit of the electrolyte.