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The ultrasonic velocity, density and viscosity of an acidic nuclear extractant namely di (2-ethylhexyl) phosphoric acid
(D2EHPA) and its binary mixtures with three monocarboxylic acids viz., acetic, propionic and n-butyric were measured
at temperature, T = 303.15 K and at pressure, P = 0.1MPa. The experimental data were utilized to compute relaxation time,
molecular association constant, deviations in intermolecular free length, acoustic impedance, free volume and change in
entropy, excess Gibb’s energy of activation of viscous flow, excess enthalpy in the entire mole fraction range of D2EHPA. The
excess/deviation functions were fitted to Redlich-Kister type polynomial equation to estimate binary coefficients and standard
errors between experimental and calculated data. The nature of these functions was utilized to speculate the nature of molecular
interaction between component molecules of all studied binary mixtures. Furthermore, 1H NMR spectra of pure D2EHPA and
its binary mixtures with the monocarboxylic acids were used to assess molecular interactions between components of liquid
mixtures at microscopic level and to corroborate with the results obtained from bulk properties.
Biswajit Dalai has completed his PhD from Utkal University, India. He is working as Assistant Professor in Department of Physics, Eastern Academy of Science and Technology, Bhubaneswar, India. He has published more than 12 papers in reputed journals.