Abstract
Densities, ρijk and speeds of sound, uijk of 1-ethyl-3-methylimidazolium tetrafluoroborate (i)+1-methyl pyrrolidin-2-one or pyrrolidin-2-one (j)+water (k) ternary mixtures have been measured over the complete mole fraction range at 293.15, 298.15, 303.15, and 308.15K using density and speed of sound analyzer (Anton Paar DSA 5000). The heat capacity, Cp of water at 293.15, 298.15, 303.15, and 308.15K have also been measured using differential scanning calorimeter (Model – μDSC 7 Evo). The measured data have been employed to determine excess molar volumes, VijkE and excess isentropic compressibilities, (κSE)ijk. The VijkE and (κSE)ijk data have been fitted to Redlich–Kister equation to calculate ternary adjustable parameters and standard deviations. The observed thermodynamic properties of the ternary mixtures have been analyzed in terms of Graph theory. It has been observed that Graph theory successfully describes well VijkE and (κSE)ijk data of the studied ternary ionic liquid mixtures.
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