Volumetric and Acoustic Studies of L-valine in Polyethylene Glycol Aqueous Solutions

The density and sound velocity measurements were carried out on L-valine in pure water and in aqueous solutions of 0.02 w/w of PEG400, PEG2000 and PEG6000 at T = (298.15, 308.15 and 318.15) K at atmospheric pressure. From these experimental data, the values of the apparent molar volume, isentropic compressibility and apparent molar isentropic compressibility were evaluated and fitted to the Redlich – Mayer equation from which the apparent molar volume and apparent molar isentropic compressibility of the solutions at infinite dilution were calculated at each temperature. Furthermore, the effect of molar mass PEG and temperature on the volumetric and comperssibility properties of the mentioned systems have been studied. The results show that molar mass of the polymer don’t affect on the values of apparent molar volume, isentropic compressibility and apparent molar isentropic compressibility.