Abstract
Pitzer's ion interaction parameters for aqueous barium chloride are derived as a function of temperature from published parameter values for the activity coefficient and for the enthalpy at 298.15 K, and by fitting osmotic coefficients measured by Holmes and Mesmer (J. Chem. Thermodyn. 1981, 13, 1025) to 473.61 K. This allows the calculation of the thermodynamic properties of barium chloride solutions including the BaCl 2 (aq) activity coefficient and the activity of water. Barium chloride mono- and dihydrate solubilities in pure water are used to calculate their solubility products at various temperatures. Solubility data of barium chloride dihydrate in the Na-K-Ca-Ba-Cl-H 2 O system are used to calculate Pitzer's mixing parameters. It is shown that the solubility of BaCl 2 .2H 2 O(s) in this system can be accurately predicted to high concentration using the resulting parameters.
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