Volumetric properties of aqueous solutions of alcohols and diols at 25 °C

Abstract

Partial molar volumes at infinite dilution, V⁰_x, and pairwise contributions to the volume, v_xx, are computed from density measurements of aqueous solutions of some polyhydroxylated compounds. A modified group-additivity approach is proposed to evaluate with precision the V⁰_x values of positional isomeric compounds, when the V⁰_x values of the first members of a few homologous series are known. The v_xx values are correlated to the corresponding V⁰_x values, confirming a previous hypothesis (C. Cascella, G. Castronuovo, V. Elia, R. Sartorio and S. Wurzburger, J. Chem. Soc., Faraday Trans., 1990, 86, 85) of a preferential ‘side-on’ orientation in non-bonding interactions for this type of compound.