Abstract
The solubility of thallium(I) chloride has been determined in aqueous solutions of strontium chloride and barium chloride at concentrations up to 1.5 mol kg−1. The data were analyzed using Pitzer's equations without making explicit assumption of association to ion pairs by assuming α=3 instead of α=2, with the β(1) term for TlCl being equivalent to the β(2) term for 2-2 electrolytes. “Best values” of β(0) and β(1) for TlCl are recommended together with K s , the activity solubility product. These were used to fit the present solubility data and derive the Pitzer model mixture parameters relevant to the systems, θfTIN and ΨfTINCl (N=Sr, Ba). Mixture parameters for TlCl+MCl+H2O systems are also derived to complete the parameter base. The fit of the experimental data was found to be worse when higher-order terms for asymmetrical mixing were included in the analysis. Activity coefficients for thallium(I) chloride in the mixtures are derived.
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Khoo, K.H., Fernando, K.R., Fereday, R.J. et al. Pitzer model parameters for sparingly soluble salts from solubility measurements. The systems TlCl+SrCl2+H2O and TlCl+BaCl2+H2O at 25°C. J Solution Chem 24, 1039–1048 (1995). https://doi.org/10.1007/BF00973520
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DOI: https://doi.org/10.1007/BF00973520