The thermodynamic treatment of a fluid in an electrostatic field is applied to the calculation of the partial molar volume of electrolytes in aqueous solutions at infinite dilution. The electrostriction may be interpreted in terms of a general solvation number that accounts for the total solvent-solute interaction. This treatment is further extended to the free energy and entropy of solvation in terms of the same intrinsic radii, giving reasonable agreement with literature data.

From the hard-sphere model proposed, i.e., that the ion and its solvation layer are incompressible, and from density and compressibility data, the variation of solvation number with concentration, the intrinsic volume of ions, and the mean distance of approach are obtained. These properties of the ions, and the molar refractions, the dipole moment of the ion pair, and the viscosity, are correlated via the solvated molar volume φ8.

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796J. PADOVA considered significant; however, the possibility exists that other molecules may also show emission properties incompatible with the currently accepted value of 0.55 for the fluorescence yield of quinine bisulfate. The this work.authors hope that additional results from other researchers working with different molecules will help to evaluate the validity of the observations reported inThe thermodynamic treatment of a mixed fluid in an electrostatic field is applied to the calculation of preferential solvation in mixed solvents at infinite dilution. The preferential solvation is interpreted in terms of partial molar free energies of solvation and is compared with literature data.

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