Thermodynamics Research Center / ThermoML | Thermochimica Acta

ABSTRACT

The density, r, and speed of sound, , of glycine, L-alanine and L-valine in aqueous 1-Methyl-3- octylimidazolium chloride solutions have been measured in the temperature interval T = (288.15 to 308.15) K and atmospheric pressure. These data have been used to calculate apparent molar volume ( ), and apparent molar adiabatic compressibility ( ) of these mixtures at all the five temperatures. The standard partial molar volumes ( ), standard partial molar volumes of transfer ( ), standard partial molar adiabatic compressibility ( ), and standard partial molar adiabatic compressibility ( ) of transfer have been determined for these amino acid solutions from density and speed of sound data and discussed in terms of solute + solvent interactions. Later, the temperature dependence of the apparent molar volume was used to calculate apparent molar expansivity and the Hepler's constant values.