Thermodynamics Research Center / ThermoML | Thermochimica Acta

ABSTRACT

The density (d) and speed of sound (u) for the binary systems (methanol + ethyl acetate) and (ethanol + methyl acetate or ethyl acetate) were measured at (298.15, 303.15, 308.15 and 313.15) K and at atmospheric pressure in this work whereas the system (methanol + methyl acetate) was measured in the literature. The apparent molar volume, , isentropic compressibility, , and apparent molar isentropic compressibility, , have been calculated using density and speed of sound data, respectively. The limiting apparent molar volume, , and limiting apparent molar isentropic compressibility, , were found by extrapolation to infinite dilution using Redlich-Mayer equation. The limiting apparent molar volume was used to obtain information about (solute-solvent) and (solutesolute) interactions. The temperature dependence of apparent molar volumes were used to calculation of apparent molar expansibility, , and Hepler's constant, values. The isobaric thermal expansion coefficient, aP, of the solutes was also calculated. Positive , values for all binary systems can be attributed to the predominance of solvent intrinsic compressibility over the solute intrinsic effect.