Thermodynamics Research Center / ThermoML | Thermochimica Acta

ABSTRACT

Apparent molar volumes (V.) 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 293.15K to 318.15K have been measured by a precise vibrating-tube digital densimeter. The calculated partial molar volumes (V0 . ) have been used to obtain the corresponding transfer partial molar volumes ( trsV0 .) of the polyol from water to various salt solutions. The experimental results show that V0 . 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. trsV0 . of myo-inositol increases with enhancement of concentration of MCl2 while decreases with the ascension of temperature. The change tendency of volume property ofmyo-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.