A VOLUMETRIC STUDY OF AQUEOUS-SOLUTIONS OF D-MANNITOL AND D-SORBITOL

The densities of aqueous solutions of D-mannitol and D-sorbitol were m easured up to the concentration of 1.0 mol kg-1 in the temperature ran ge from 293 to 318 K. On the basis of these volumetric data, the appar ent molar volumes, the partial molar expansibilities, as well as the t hermal expansion coefficients were determined. The apparent molar volu mes were found to be concentration independent and their temperature d ependence non-linear. In addition, the difference in solvation Gibbs f ree energy of the solvent in solution relative to the pure solvent was calculated, and some virial interaction coefficients for the excess p roperties of solutions were evaluated and interpreted in terms of solu te-solute and solute-solvent interactions.