Abstract
Abstract The osmotic coefficients of the mixed electrolyte solution {xKNO3+(1−x)MgSO4}(aq) have been measured by the isopiestic method at the temperature 298.15 K. The activity coefficients of KNO3and MgSO4were calculated by Scatchard's neutral-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 KNO3and also for a test of Zdanovskii's rule of linearity.
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