Thermodynamics of Mixed Electrolyte Solutions

A general thermodynamic expression has been derived for the deviation Δ from Zdanovskii's rule. Conditions have been deduced under which Δ vanishes, and examples given. For nonzero values of Δ it has been shown by means of an example that Δ may be evaluated in some cases by the introduction of empirical assumptions, such as Harned's rule. The use of Zdanovskii's rule in facilitating the integration of the McKay–Perring equation has been discussed briefly.