pH of toluene in BmimBF4 and BmimPF6 ionic liquids

摘要

The pH value of binary mixtures containing toluene and 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim][PF6]) and 1-butyl-3-methytimidazolium tetrafluoroborate ([Bmim][BF4]) ionic liquids over the range of ionic liquids mole fraction (xIL) from (1.0 to 0.60)and temperature range from (293.15 to 340.65) K were measured.The range of the pH values of toluene and [Bmim][BF4] and [Bmim][PF6] were from (3.16 to 4.63) and (5.57 to 7.55),respectively.Comparison showed that the pH of toluene in the two ionic liquids was in sequence:[Bmim] [BF4] ＜ [Bmim] [PF6].The temperature dependency of the pH value was correlated using an empirical equation.The correlations gave satisfactory results.