Abstract
A model based on solvation-electrostriction-ionization properties is developed to fit the critical density curve of aqueous sodium chloride solutions from 0 to 4.28 molal at temperatures from 374 to 566°C. Apparent solution ideality is observed. The description indicates that each ion significantly electrostricts roughly 800 water molecules and neutral NaCl electrostricts insignificantly. Lack of electrostriction for neutral NaCl may explain why complete constants describe ionization equilibria so well. Molal volumes and pseudo-apparent molal volumes are described for both actual solutions and hypothetical solutions containing either 100% neutral NaCl molecules or fully ionized electrolyte (Na++Cl−).
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Marshall, W.L. Volume, electrostriction, and solvation relations along the liquid-vapor critical curve of aqueous sodium chloride solutions. J Solution Chem 22, 539–555 (1993). https://doi.org/10.1007/BF00646930
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DOI: https://doi.org/10.1007/BF00646930