Abstract

In the mixed electrolyte solution { xMg(NO 3) 2+ (1 − x)MgSO 4}(aq) the osmotic coefficients have been measured by the isopiestic method at the temperature 298.15 K. The activity coefficients of (NO 3) 2and MgSO 4were calculated by Scatchard’s neural-electrolyte method and by Pitzer and Kim’s treatment for mixed-electrolyte solutions. The results are used for calculation of the excess Gibbs free energy as a function of ionic strength and ionic-strength fraction of Mg(NO 3) 2and also for a test of Zdanovskii’s rule.

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