Ionic liquid 1-methyl-3-(3-sulfopropyl)-imidazolium hydrogen sulfate ([C3SO3HMIM[HSO4]) was synthesized and characterized by infrared spectroscopy (IR), nuclear magnetic resonance (H-1 and C-13 NMR) and ultraviolet-visible (UV-Vis) spectra. Its thermal stability was also examined by thermogravimetric analysis (TGA) and a differential scanning calorimeter (DSC). The mole fraction solubilities of [C3SO3HMIM][HSO4]) in 12 selected solvents (n-pentane, n-hexane, n-heptane, benzene, toluene, ethylbenzene, acetone, 2-butanone, 3-methyl-2-butanone, tetrahydrofuran, ethyl acetate and dichloromethane) in the temperature range from 289.15 to 363.15 K were measured using a static analytical method and correlated with an empirical equation.