Abstract
At a temperature of 155.5°C, isopiestic measurements have been made for the ternary system KCl−MgCl2−H2O at 12 different solute mole fractions. Total equilibrium molalities ranged up to 9.71 mol-kg−1. MgCl2(aq) was chosen as the reference electrolyte. A description of the osmotic coefficients by the ion interaction model of Pitzer gave an overall standard error of 0.0177. The binary Pitzer parameters have been taken from Holmes, Mesmer, and Valyashko et al. for KCl(aq) and MgCl2(aq), respectively. It was necessary to use both mixing parametersΘMgK andΨMgKCl for the fit, but an additional introduction of an ionic strength dependence for these parameters yielded no further improvement. Due to the solubility limits the modified B.E.T. equation according to Stokes and Robinson could be applied only to a small subset of all data points.
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