Densities and Viscosities of 1-Butyl-3-methylimidazolium Trifluoromethanesulfonate + H2O Binary Mixtures at T = (303.15 to 343.15) K

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.