Abstract
The solubility of thallium (I) chloride has been studied in aqueous mixtures of HCl and NaCl at 25°C at ionic strengths ranging from 0.10 to 3.20 mol-kg−1. Activity coefficients were derived and fitted to Pitzer's equations. This required values of the single-electrolyte parameters, β0, β1 and Cφ for TlCl. Since these are not available in the literature, owing to the low solubility of TlCl in water, a method has been devised for evaluating these parameters. These were then used to determine the mixing parameters, θ and ψ, for the system. Consideration of the higher-order limiting law for symmetrical mixing did not improve the accuracy of the fit. The success with which the ion-interaction theory in its simplest form has been able to model the present system to such a high ionic strength shows that it is not necessary to treat ion association in the system explicitly in terms of an ion association equilibrium constant.
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Khoo, K.H., Fernando, K.R. Solubility and activity coefficient of thallium (I) chloride in the system TlCl+HCl+NaCl+H2O at 25°C. J Solution Chem 20, 1199–1211 (1991). https://doi.org/10.1007/BF01075136
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DOI: https://doi.org/10.1007/BF01075136