Abstract
The proposed extension to the Stokes and Robinson hydration theory is based on the premise that H2O molecules of electrolyte solutions reside in two unique environments, the solvent environment and the hydration envelope (or sheath) environment. Changes to the chemical potential of H2O in either environment result in redistribution of H2O molecules between the environments; consequently hydration numbers of electrolytes decrease as the solvent activity decreases. An equation derived from the theory and containing two adjustable parameters reproduces electrolyte activity coefficients more accurately than does the original Stokes and Robinson equation.
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Nesbitt, H.W. The stokes and robinson hydration theory: A modification with application to concentrated electrolyte solutions. J Solution Chem 11, 415–422 (1982). https://doi.org/10.1007/BF00649040
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DOI: https://doi.org/10.1007/BF00649040