Abstract

A systematic attempt to estimate the quantitative validity of the charge-dipole model of cation hydration is made by giving the model a quantum-theoretical structure. It is shown, in the first order of approximation, that physically reasonable results may be obtained for the proton affinity of H2O and the Gibbs potential and entropy of hydrate water. The calculated proton affinity, for example, is different by about 20% from the average of the observed values. It is concluded that because of the structural simplicity of the charge-dipole model a truly quantitative theory of cation hydration may be developed by perturbation-theoretic techniques and the incisive choice of parameters to define the multipole field of the water molecule.

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