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In the present work, new data on the densities and refractive indices for 1-hexyl-3-methylimidazolium tris(pentafluoroethyl)trifluorophosphate [hmim] [FAP] with N-methyldiethanolamine are reported for various concentrations and at temperatures (303.15-328.15) K. Excess molar volumes V E and excess refractive indices n E D were calculated from the experimental data. Refractive index values for the binary mixtures were predicted by using Lorentz-Lorenz, Gladstone-Dale and Eykman equations. Excess molar volumes showed positive trend, whereas excess refractive indices showed negative trend over the entire range of temperatures and concentrations studied in the present research.

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