Room temperature ionic liquids of 1-butyl-3-methylimidazolium tetrafluoroborate,[bmim][BF4] , nitrate,[NO3]−, phosphate,[PO4] 3−, and hydrogen sulfate,[HSO4]−, have been synthesized and characterized by 1H-NMR, 13C-NMR, mass spectrometry and IR spectroscopy methods. The effect of nature of inorganic anion on hygroscopic property has been studied. Physicochemical properties such as density, viscosity, melting point, freezing point, glass ...
