Electrocapillary properties of the interface between two immiscible electrolyte solutions. Equation of electrocapillarity in Hansen's form

The paper discusses the thermodynamic theory of electrocapillary phenomena at the interface between two immiscible electrolyte solutions. A generalized equation of electrocapillarity for polarizable and reversible interfaces is derived by Hansen's method. The Gibbs equation for electrolytic systems is obtained, both in variables corresponding to ionic concentrations and in variables corresponding to the concentrations of neutral combinations of the ions. The relation is discussed which exists between the ionic concentrations in the system and the emf of a cell consisting of the immiscible electrolyte solutions and the reversible electrodes with terminals made of identical metals.