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Ionic liquid (IL) [Smim][HSO 4 ] (1-heptyl-3-methyl-imidazolium hydrogen sulfate) was synthesized and characterized. The density and surface tension of the IL were determined in temperature range 293.15 to 343.15±0.05K. Some physical–chemical properties of the IL have been calculated or estimated by the empirical methods. In terms of Glasser's theory, the standard molar entropy and lattice...