Thermodynamics of ion hydration and its interpretation in terms of a common model

Yizhak Marcus*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

92 Scopus citations

Abstract

The relationship between the conventional standard molar thermodynamic quantities of hydration of an ion and the corresponding quantities of solvation, that are due entirely to its interactions with its aqueous environment, is presented. The TATB assumption, i.e., that quantities pertaining to the tetraphenyl-arsonium cation equal those pertaining to the tetraphenylborate anion, is applied to the standard enthalpy, entropy, and Gibbs energy of hydration of ions, and to the standard partial molar heat capacity and volume of aqueous ions. A model of the hydrated ion, consisting of a layer of completely immobilized water molecules surrounded by a dielectric continuum affected by the field of the ion and water the structure of which is modified, is presented. The thickness of the first layer and the number of water molecules in it is proportional to the radius of the ion. The model is shown to be compatible with all these thermodynamic quantities.

Original languageEnglish
Pages (from-to)1093-1101
Number of pages9
JournalPure and Applied Chemistry
Volume59
Issue number9
DOIs
StatePublished - 1 Jan 1987
Externally publishedYes

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