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

Apparent molar volumes (Vφ) 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 (Vφ0) have been used to obtain the corresponding transfer partial molar volumes (ΔtrsVφ0) of the polyol from water to various salt solutions. The experimental results show that Vφ0 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. ΔtrsVφ0 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.