Single-ion hydration thermodynamics from clusters to bulk solutions: Recent insights from molecular modeling

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Abstract

The importance of single-ion hydration thermodynamic properties for understanding the driving forces of aqueous electrolyte processes, along with the impossibility of their direct experimental measurement, have prompted a large number of experimental, theoretical, and computational studies aimed at separating the cation and anion contributions. Here we provide an overview of historical approaches based on extrathermodynamic assumptions and more recent computational studies of single-ion hydration in order to evaluate the approximations involved in these methods, quantify their accuracy, reliability, and limitations in the light of the latest developments. We also offer new insights into the factors that influence the accuracy of ion-water interaction models and our views on possible ways to fill this substantial knowledge gap in aqueous physical chemistry.

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Vlcek, L., & Chialvo, A. A. (2016). Single-ion hydration thermodynamics from clusters to bulk solutions: Recent insights from molecular modeling. Fluid Phase Equilibria, 407, 58–75. https://doi.org/10.1016/j.fluid.2015.05.048

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