Volumetric Parameters of Interaction of Monosaccharides (D-xylose, D-arabinose, D-glucose, D-galactose) with NaI in Water at 298.15 K

Abstract

Densities for monosaccharide (D-xylose, D-arabinose, D-glucose, D-galactose)–NaI–water solutions were measured at 298.15 K and were used to calculate the apparent molar volumes of these saccharides and NaI. Infinite dilution apparent molar volumes for the saccharides (VΦ,S∘) in aqueous NaI and those for NaI (VΦ,E∘) in aqueous saccharide solutions and partial molar volumes of the saccharides (VS) and NaI (VE) at each composition have been evaluated, together with the standard transfer volumes of the saccharides (Δtr VS∘) from water to aqueous NaI and those of NaI (ΔtrVE∘) from water to aqueous saccharide solutions. It was shown that the Δ tr VS∘ and ΔtrVE∘ values are positive and increase with increasing co-solute molalities. Volumetric parameters indicating the interactions of NaI with saccharides in water were also obtained and applied to explore the interactions between saccharides and NaI in water. A comparison of the νES value for NaI with those for NaCl and NaBr showed that for a given saccharide, except for glucose, the νES value for NaBr is the largest of three sodium halides (NaCl, NaBr and NaI). These were interpreted in terms of the apparent molar electrostriction volumes (Δ Ve) and the structure interaction model.