Volumetric properties of alcohols in dilute aqueous solutions

Abstract

The densities of dilute (mole fraction concentration < 2 × 10^–3) aqueous solutions of the four isomeric butanols have been determined at 0.5, 5, 25 and 40°, and solute partial molar volumes and expansibilities have been evaluated. Extrapolations of volume data to infinite dilution are analyzed, and the limiting volumes and expansibilities are interpreted in terms of the effects of alcohols on the structural properties of water. The concentration and temperature dependences of the partial volumes indicate the presence of long-range interactions between hydrated solute molecules.