Abstract
The temperature dependence of the parameters for symmetrical mixing of ions of the same sign in the virial-coefficient (Pitzer) system are evaluated from literature data on heats of mixing in the presence of a common ion for 20 systems. The higher-order limiting law for symmetrical mixing is used in the form of an expression for the ionic strength dependence of the binary mixing parameter. Heats of mixing of the MX-NYtype (without common ion) are calculated for eight systems from these parameters and found to be in excellent agreement with experimental values. Since pure-electrolyte parameters are required for the non-common-ion calculations, these are calculated as needed from recently published data.
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Phutela, R.C., Pitzer, K.S. Thermodynamics of electrolyte mixtures. Enthalpy and the effect of temperature on the activity coefficient. J Solution Chem 15, 649–662 (1986). https://doi.org/10.1007/BF00644597
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DOI: https://doi.org/10.1007/BF00644597