A comparative study on the effect of temperature and concentration on density, sound velocity and their derived properties for diclofenac potassium in aqueous urea media

Abstract

The present study has undertaken experimental measurements of ultrasonic velocity (U) and density (d) of solutions of Diclofenac potassium in water and in aqueous urea media of different molar concentrations. Computation of physico-chemical parameters like apparent molar volume (VΦ), limiting apparent molar volume (VΦ0), apparent molar expansibility (EΦ), limiting apparent molar expansibility (EΦ0), molar isentropic compressibility (Ks), apparent molar isentropic compressibility(Ks,ɸ),molar adiabatic compressibility (W), molar isothermal compressibility (KT), acoustic impedance (Z), free volume (Vf), internal pressure (πi), relative association (RA), coefficient of thermal expansion (α) and van der Waals constant (b) was done by using the experimentally obtained values. The influence of varying concentrations of Diclofenac potassium as well as of urea in solutions and the variation of the investigating temperatures on the above mentioned parameters are expected to reveal the nature of different molecular interactions existing in the drug solutions.