ELECTROLYTIC CONDUCTIVITY OF MIXED ELECTROLYTE-SOLUTIONS

Electrolytic conductivity of mixed electrolyte solutions has been studied theoretically and experimentally on the basis of recent phenomenological theories of conductivity. For 1:1 electrolytes a generalised mixture rule is deduced, applicable to mixtures of any number of ionic species. For mixtures of dissimilar electrolytes the simple mixture rule does not apply. However, for mixtures of 1:1 electrolytes with electrolytes of other charge type (2:2, 2:1 electrolytes), when the 1:1 electrolyte is present in marginal quantities, a modified additivity rule is established. In this case the 1:1 electrolyte can be used to probe the properties of the dominant electrolyte in the solution.