Enthalpy of Dilution of Aqueous [C4mim][Gly] at 298.15 K
journal contributionposted on 08.10.2009, 00:00 by Wei Guan, Wei-Feng Xue, San-ping Chen, Da-Wei Fang, Yan Huang, Sheng-Li Gao
A novel amino acid ionic liquid [C4mim][Gly] (1-butyl-3-methylimidazolium glycine) was prepared by a neutralization method. The molar enthalpies of dilution, ΔDHm(mi→mf), of aqueous [C4mim][Gly] at various molalities were measured at (298.15 ± 0.01) K. The values of the apparent relative molar enthalpy, φL, were calculated by using both the extended Debye−Hückel equation and the Pitzer equation, which were in good agreement within experimental error. In terms of φL, the molar enthalpies of solution of [C4mim][Gly], ΔsHm, at various molalities were estimated. The estimated values of ΔsHm were consistent with the experimental values previously obtained.