Thermodynamics Research Center / ThermoML | International Journal of Thermophysics

ABSTRACT

Ultrasonic-velocity and density measurements of aqueous solutions of maleic acid and tartaric acid have been made as a function of molality, at T=(298.15 and 308.15) K, and at atmospheric pressure. A molality range has been studied from (0.2603 to 2.6309) mol*kg-1 and (0.4451 to 2.6621) mol*kg-1 for maleic and tartaric acids, respectively. The experimental data have been correlated with molality using a polynomial equation. Furthermore, apparent molar volume, partial molar volume, apparent-specific molar volume, isentropic compressibility, apparent molar isentropic compressibility, limiting apparent molar isentropic compressibility, and isentropic apparent-specific compressibility values have been calculated from experimental values of densities and ultrasonic velocities. The calculated parameters have been interpreted in terms of solute solvent interactions, solute solute interactions, structure making/breaking behavior of acids, and their taste quality in water.