THERMODYNAMICS AND TOPOLOGICAL INVESTIGATIONS OF TERNARY MIXTURES CONTAINING IONIC LIQUID WITH ORGANIC SOLVENTS: EXCESS MOLAR VOLUMES AND EXCESS ISENTROPIC COMPRESSIBILITIES

10.22376/ijpbs.2019.10.1.p1-12

Volume 6 Issue 2 2015 (April - June) THERMODYNAMICS AND TOPOLOGICAL INVESTIGATIONS OF TERNARY MIXTURES CONTAINING IONIC LIQUID WITH ORGANIC SOLVENTS: EXCESS MOLAR VOLUMES AND EXCESS ISENTROPIC COMPRESSIBILITIES We report densities, ρ lessThan sub greaterThan ijk lessThan /sub greaterThan and speeds of sound, u lessThan sub greaterThan ijk lessThan /sub greaterThan of 1-ethyl-3-methylimidazolium tetrafluoroborate (i) + water (j) + formamide or N,N- dimethylformamide (k) ternary mixtures over entire composition range at 293.15, 298.15, 303.15, 308.15 K. The heat capacities, Cpof 1-ethyl-3-methylimidazolium tetrafluoroborate, water, formamideand N,N- dimethylformamide have also been measured at 293.15, 298.15, 303.15, 308.15 K using micro differential scanning calorimeter (Model -µDSC 7 Evo). The measured ρ lessThan sub greaterThan ijk lessThan /sub greaterThan and u lessThan sub greaterThan ijk lessThan /sub greaterThan data have been utilized to determine their excess molar volumes, V lessThan sub greaterThan ijk lessThan /sub greaterThan lessThan sup greaterThan E lessThan /sup greaterThan and excess isentropic compressibilities, (κ lessThan sup greaterThan E lessThan /sup greaterThan lessThan sub greaterThan S lessThan /sub greaterThan ) lessThan sub greaterThan ijk lessThan /sub greaterThan values. In this study, we have used the topology of the constituent mixtures (Graph theory) to determine E ijkV and ( ) E S ijk κ values of the investigated mixtures. Results obtained indicate that V lessThan sup greaterThan E lessThan /sup greaterThan lessThan sub greaterThan ijk lessThan /sub greaterThan and (κ lessThan sup greaterThan E lessThan /sup greaterThan lessThan sub greaterThan S lessThan /sub greaterThan ) lessThan sub greaterThan ijk lessThan /sub greaterThan values determined by Graph theory compare well with their corresponding experimental values.The observed V lessThan sup greaterThan E lessThan /sup greaterThan lessThan sub greaterThan ijk lessThan /sub greaterThan , (κ lessThan sup greaterThan E lessThan /sup greaterThan lessThan sub greaterThan S lessThan /sub greaterThan ) lessThan sub greaterThan ijk lessThan /sub greaterThan data have also been analyzed in terms of PrigogineFlory-Patterson theory. V. K. SHARMA, S. BHAGOUR, S. SOLANKI AND J. KATARIA 611-633