Densities and viscosities for the binary mixtures of H 2 O (1) + 1-butyl-3-methylimidazolium trifluoromethanesulfonate ([BMIM][CF 3 SO 3 ]) (2) were measured over the entire mole fraction range from (303.15 to 343.15) K at atmospheric pressure. Excess molar volumes and viscosity deviations as a function of mole fraction average were derived, and the results were fitted to the Redlich-Kister equation using a multiparametric nonlinear regression method. Estimated coefficients of the Redlich-Kister equation and standard error calculated from the Redlich-Kister equation to the experimental data are also presented. The results show that the densities and viscosities are dependent on water content and temperature.

Activity coefficients at infinite dilution γ i ∞ have been measured for 17 organic solutessalkanes, alkenes, and alkyl benzenessin the ionic liquid 1-butyl-3-methylimidazolium trifluoromethanesulfonate ([BMIM][CF 3 SO 3 ]) by the gas-liquid chromatographic method with the ionic liquid as the stationary phase. The measurements were carried out from (303.15 to 363.15) K. The partial molar excess enthalpies at infinite dilution H i E,∞ of the solutes in the ionic liquid were also derived from the temperature dependence of the γ i ∞ values.

The activity coefficients at infinite dilution, γ i ∞, for 25 organic solutes, alkanes, alkenes, alkyl benzenes, acetonitrile, acetone, 1,4-dioxane, tetrahydrofuran, ethyl acetate, and chloromethanes, in the ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF4]) have been measured by the gas−liquid chromatographic method at temperatures from (303.15 to 363.15) K. The partial molar excess enthalpies at infinite dilution, H i E,∞, of the solutes in the ionic liquid were also derived from the temperature dependence of the γ i ∞ values.

Activity coefficients at infinite dilution γ i ∞ have been determined for 17 organic solutes, alkanes, alkenes, and alkyl benzenes, in the ionic liquid 1-hexyl-3-methylimidazolium trifluoromethanesulfonate ([HMIM][CF 3 SO 3 ]) by the gas-liquid chromatographic (GLC) method with the ionic liquid as the stationary phase. The measurements were carried out in the temperature range of (303.15 to 363.15) K. The partial molar excess enthalpies at infinite dilution H i E,∞ were also determined for the solutes from the temperature dependence of the γ i ∞ values.