Densities and apparent molar volumes of myo-inositol in aqueous solutions of alkaline earth metal salts at different temperatures

摘要

Apparent molar volumes (V-phi) of myo-inositol in water and in aqueous solutions of alkaline earth metal salt MCl2 (M = Mg, Ca, Sr, Ba) under various concentrations and temperatures ranging from 293.15 K to 318.15 K have been measured by a precise vibrating-tube digital densimeter. The calculated partial molar volumes (V-phi(0)) have been Used to obtain the corresponding transfer partial molar volumes of (Delta V-trs(phi)0) of the polyol from water to various Salt Solutions. The experimental results show that V-phi(0) of myo-inositol increases with enhancement of salt concentration and ascension of temperature. The interpretation is that these results arise from the dominant interaction of MCl2 with the charged centers of myo-inositol. Delta V-trs(phi)0 of myo-inositol increases with enhancement of concentration of MCl2 while decreases with the ascension of temperature. The change tendency of volume property of myo-inositol has been rationalized in the light of weak interactions between myo-inositol molecules, the polyol molecules and coexistent ions as well as the polyol molecules and Solvent molecules with a cosphere overlap model applied.