Hydration of tri-n-octylamine hydrobromide and tri-n-octylamine hydroiodide benzene solutions |
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| Affiliation: | 1. Ministry of Education Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Hohai University, Nanjing 210098, PR China;2. College of Environment, Hohai University, Nanjing 210098, PR China;3. Suzhou Water Supply Company Limited, Suzhou 215002, PR China;1. Sustainable Materials Lab, Department of Chemical Engineering, KU Leuven, campus Kulak Kortrijk, Etienne Sabbelaan 53, 8500 Kortrijk, Belgium;2. Department of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden;3. Laboratory for Soft Matter Physics and Biophysics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D box 2416, 3001 Leuven, Belgium |
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| Abstract: | ![]()
Isopiestic equilibrations of TOAHBr and TOAHI benzene solutions were made in the concentration range from 0.02 to 0.15 mol/kg at different water activities and 25°C. Limiting hydration numbers of 0.585 ± 0.009 for the bromine ion and 0.340 ± 0.009 for the iodine ion were found at unit water actifity for the systems investigated. The Gibbs-Duhem relation for a ternary system was applied to determine the effects of water activity on the amine salt activity. From the low frequency band in the IR spectra, corresponding to stretching of the “bonded” OH, the hydrogen bond energy between the halide ion and water molecule was evaluated and amounted to: 4.4; 4.0 and 3.4 kcal/bond for the chlorine, bromine and iodine ions, respectively. The isopiestic as well as IR data reveal the following order in proton-acceptor abilities of the halide ions: Cl− > Br− > I−. |
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