Volumetric properties of aqueous solutions of polyols between 0.5 and 25 °C

Abstract

The volumetric properties of aqueous solutions containing non-electrolytes have been determined by density measurements in the temperature range 0.5–25 °C. Linear polyols CH₂OH(CHOH)_nCH₂OH with n= 2–4 (n= 4 has three diasteroisomers), myo-inositol and t-butylurea have been studied. V^°_x and the coefficients of the virial expansion of the excess property (V_xx, V_xxx…) have been evaluated and interpreted in terms of solute–solute and solute–solvent interactions with the aid of the enthalpy and free-energy data where known. The theory of group contributions has been used to interpret the V_xx values of those linear polyols not exhibiting solute–solute interactions at 25 °C. The results confirm the relation between the signs of the enthalpic and volumetric contributions also found for other kinds of non-electrolyte.