Dielectric constants of water-ethanol-sucrose and water-ethanol-sorbitol systems have been experimentally determined. Dielectric constant values in these systems were generally found to be a complex function of composition expressed as weight per cent. Data are presented which will allow generation of dielectric constantcomposition relationships oYer a dielectric constant range between 40 and 70.
HE PREVIOUS publication in this series (1) pre-T sented dielectric constant data for waterethanol-glycerin and water-ethanol-propylene glycol systems. Dielectric constants were shown to be linear functions of the concentrations of the various components expressed on a per cent by volume basis. Because of various complexities of the systems, however, no simple relationship appeared to exist between dielectric constants of the mixtures and those of the pure components. A simplified form of the Onsager-Kirkwood equation could not be employed t o calculate dielectric constants in such systems. It was proposed that precise values for dielectric constants of multicomponent mixtures could best be obtained by experimental measurement. This report presents dielectric constant data for two common pharmaceutical solvent systems, water-ethanol-sucrose and water-ethanol-sorbitol.