Abstract

The component solubilities of the HCl-MgCl2-H2O system at −5°C were predicted by using the Pitzer ion interaction model and its extended Harvie and Weare model. The results indicated that the model supplies a good prediction of the above-mentioned system. The values of parameters of β(0), β(1), and Cφ of HCl and MgCl2 were obtained by using the same optimization methods as in the literature, while those of θMgH and ΨMgHCl were derived by extrapolating the published data of 5, 15, 25, 35, and 45°C, as well as coupling the activity coefficients with the solubility data. The comparison between the calculated results and the experimental data indicated that the Pitzer ion interaction model and its extended Harvie and Weare model are quite reliable in the solubility prediction.

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