Collection of Czechoslovak Chemical Communications - digital archive 

Abstract

A simplified model has been set up for calculation of the molar Gibbs energy of mixing ∆_mixG_m(s) in crystals based on the assumption of a complete liquid-solid thermodynamic equilibrium in the water-salt systems. The procedure allows the ∆_mixG_m(s) values to be calculated from the experimental solubility data for the saturated binary and ternary solutions. The ∆_mixG_m(s) values and the excess Gibbs energy of mixing ∆_mixG^E_m(s) were calculated for six alkali-halide systems (KCl-RbCl-H₂O, KBr-RbBr-H₂O, KI-RbI-H₂O, NH₄Cl-NH₄Br-H₂O, RbCl-RbBr-H₂O and CsCl-CsBr-H₂O). The results obtained were compared with experimental data taken from the literature and values calculated based on various theoretical approaches.

Keywords: Mixing energy; Crystals; Binary ternary solutions.