Collect. Czech. Chem. Commun. 1987, 52, 1672-1679

A lattice model of electrolytes for the whole concentration range

Ivan Horsák and Ivo Sláma

Institute of Inorganic Chemistry, Czechoslovak Academy of Sciences, 160 00 Prague 6


Based on the quasi-lattice concept, a simple model is proposed for calculating the quantities of mixing of strong electrolyte solutions over the whole concentration range from pure solvent to pure salt. This model is analogous to the regular solution model for non-electrolyte systems. Relationships for the activity coefficients of the solvent and salt have been derived, and the behaviour of the model in the limit of infinite dilution is discussed by comparison with the Debye-Huckel theory. The adequacy of equations derived from the proposed model has been tested by fitting published experimental data for the activities of water in the systems (Li, K)NO3-H2O and (Ag, Tl)NO3-H2O, which have been measured over the whole concentration range.