Ion-Solvent Interactions According to the Mean Spherical Approximation

5 Ion-Solvent Interactions According to the Mean Spherical Approximation 

In the following, the radius of a solvent molecule represented as a sphere is denoted by and that of either a cation or anion by r . The conditions which define the direct correlation function are the following. 

Only one result from this model is presented here, namely, the Gibbs energy of ion iipole interactions in the limit of infinite dilution, Gy- Further, if one identifies this with the Gibbs solvation energy, the result is 

By using the bulk dielectric permittivity, the value of A,s includes consideration not only of the dipole moment of the solvent but also its polarizability and other features which are necessary to describe ion iipole and dipole lipole interac- 

In the case of water at 298 K, the value of Xs estimated from Sj (78.46) is 2.65. It should be noted that the role of dipole-dipole interactions in determining A Gi is ignored in equation (3.5.7). 

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