PREDICTION OF PROPERTIES OF MIXED ELECTROLYTES FROM MEASUREMENTS ON COMMON ION MIXTURES

An equation predicting the free energy enthalpy and volume of a general mixture of electrolytes has been derived. The equation, developed from the work of Friedman, predicts the properties of the mixed electrolyte solution from a knowledge of the properties of pure electrolytes and common ion mixtures. The equation allows for all possible pairwise interactions and will be most accurate when all of the electrolytes are of the type normally considered to be fully dissociated. The equation has been used to derive a general form of the cross-square rule. This general form applies to any mixture of salts whether the mixture is symmetric or asymmetric.