ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 54, Number 3
JKCSEZ 54(3)
June 20, 2010 

The solubility and the physicochemical property (refractive index) in the NaCl-CaCl₂-H₂O and KCl-CaCl₂-H₂O systems were determined at 50 ^oC and the phase diagrams and the diagrams of physicochemical property vs composition were plotted. One invariant point, two univariant curves, and two crystallization zones, corresponding to sodium Chloride (or potassium chloride), dihydrate (CaCl₂·2H₂O) showed up in the phase diagrams of the ternary systems. The mixing parameters θ_M,Ca and Ψ_M,Ca,Cl (M = Na or K) and equilibrium constant K_sp were evaluated in NaCl-CaCl₂-H₂O and KCl-CaCl₂-H₂O systems by least-squares optimization procedure, in which the single-salt Pitzer parameters of NaCl, KCl and CaCl₂ β⁽⁰⁾, β⁽¹⁾, β⁽²⁾ and C^ф were directly calculated from the literature. The results obtained were in good agreement with the experimental data.