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Abstract
The densities of binary and ternary mixtures were measured for the system 1-ethyl-3-methylimidazolium bis(perfluoroethylsulfonyl)imide ([EMIM]+[BETI]−) + methanol or + acetone and [EMIM]+[BETI]− + methanol + acetone, respectively, at T = (298.15, 303.15, and 313.15) K, and the speed of sound data for the binary system 1-ethyl-3-methylimidazolium diethyleneglycol monomethylethersulfate ([EMIM]+[CH3(OCH2CH2)2OSO3]−) + methanol were measured at T = 298.15 K. The excess molar volumes were calculated from the experimental densities and were fitted to the Redlich-Kister equation for the binary system. The excess molar volumes, VmE, for the binary system ([EMIM]+[BETI]− + methanol) were positive for low mole fractions of methanol, and for the binary system ([EMIM]+[BETI]− + acetone), excess molar volumes were negative throughout the whole composition range. The ternary excess molar volumes were negative for all three temperatures. The isentropic compressibility for the binary system ([EMIM]+[CH3(OCH2CH2)2OSO3]− ...
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