Abstract
The osmotic coefficients of aqueous solutions of ethylene glycol (MEG), diethylene glycol (DEG), triethylene glycol (TEG) and tetraethylene glycol (TTEG) were determined by freezing point measurements. On the basis of these data the activity coefficient of the solute, the excess Gibbs free energies of solution as well as the respective partial molar functions of solute and solvent were determined. The linear coefficient of the thermodynamic function characterising the limiting effect of a solute on the solvation quantities of a water molecule was calculated from the partial molar volume and expansibilities of the investigated compounds. For more concentrated solutions the difference in Gibbs free energy of a solvent molecule relative to the pure solvent were estimated and from the temperature dependence of the difference in the Gibbs free energy, the difference in the enthalpy and entropy of a solvent molecule in solution were calculated.
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