Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

In the present paper, we report new experimental data on density (rho)) and speed of sound (u) in binary liquid mixtures of 1-ethyl-3-methylimidazolium hydrogen sulphate, [emim][HSO4] with polar protic solvents ethanol (EtOH) and 1-propanol (n-PrOH) and aprotic solvent, dimethyl sulphoxide (DMSO) over the complete range of mole fraction at 298.15 K T 313.15 K, every 5 K, and 0.1 MPa pressure. The mixing behaviour of the binary systems of [emim][HSO4] with EtOH, n-PrOH, and DMSO has been studied by computing the excess volumes (VE) and excess isentropic compressibilities (0sE) utilizing the measured densities (rho)) and speeds of sound (u). Further, the excess functions VE and 0sE are correlated with mole fraction, using Redlich-Kister equation to derive the fitting parameters. For the systems studied, the excess thermodynamic properties (VE and 0sE) are found to be negative over the whole range of composition at investigated temperatures. Also, the experimental results are discussed in terms of ion-ion, ion -dipole, hydrogen bonding interactions and interstitial accommodation between component molecules in the binary liquid mixtures. Moreover, the temperature dependence of the physicochemical and excess properties has been studied.