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Thermodynamics of sodium chloride solutions at high temperatures

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Abstract

Osmotic coefficients are reported from vapor-pressure-lowering measurements on sodium chloride solutions at concentrations from approximately 4m to saturation and at temperatures from 75° C to 300° C. In combination with previously reported measurements at lower concentrations, these results allow a correlation of free energies for the system NaCl−H2O over a range of concentrations and temperatures that is unprecedented for any aqueous electrolyte. Activity coefficients and other thermodynamic quantities for both salt and water have been calculated for the complete range of concentrations and temperatures. Calculated heats of solution and standard partial molal entropies agree well with calorimetric determinations where comparison is possible. The excess partial molal entropy of the salt is informative concerning structural effects and their changes with temperature and concentration.

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Liu, Ct., Lindsay, W.T. Thermodynamics of sodium chloride solutions at high temperatures. J Solution Chem 1, 45–69 (1972). https://doi.org/10.1007/BF00648416

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