Abstract
Abstract The individual ionic activity coefficients of strong electrolytes in dilute aqueous solutions are derived from the ionic conductivity data, using the Debye-Hückel-Onsager theory of strong electrolyte solutions. The mean activity coefficients computed by the present method are in good agreement with the experimental values in most of the uni-univalent and some of the uni-multivalent electrolytes studied, which demonstrates the validity of the method in deriving the individual ionic activity coefficients. Comparisons are made of the values of individual activity coefficients of various ions in dilute aqueous solutions of strong electrolytes, as determined by different methods including measurements of potential differences across membranes at varying concentrations. The influence of the ion of opposite sign on the individual ionic activity coefficient has been observed.
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