The electrical conductance of tetraethylammonium bromide and chloride in nitromethane.

The first major contribution to the theory of electrolytic conductivity was made by Kohlrausch (ll) who found that molar conductivity could be expressed as the sum of two quantities - the individual conductances of the anions and cations. He called this the "Law of' Independent Movement of Ions”. The next advance to the theory was made by Arrhenius (13). He assumed that a solution is composed of ions and neutral molecules and that the proportion of ions increased with increasing dilution