Abstract

In the present work the density, speed of sound and viscosity (ƞ) data for trilithium citrate and triammonium citrate in aqueous [Emim][HSO4] are determined experimentally over a range of concentration (0.0369–0.0514) mol kg−1 and temperature between 293.15 and 313.15 K. Using the density and speed of sound data the volumetric and compressibility parameters are evaluated. By graphical fitting of the evaluated parameters in some standard relations the partial molar parameters i.e. standard molar volumes (Voϕ) and standard molar compressibilities (K°ϕ,s) are calculated. The transfer parameters of volume (ΔtrV°ϕ) and compressibility (ΔtrK°ϕ,S) studies evaluated using the partial molar parameters are used to deduct the solute-solvent interactions by means of the cosphere overlap model which shows that the hydrophilic-hydrophilic and ion-hydrophilic interactions are less dominant in the solution over the hydrophobic-hydrophobic and ion-hydrophobic interactions. The viscosity data is utilized to calculate the relative viscosity (ηr) and viscosity B-coefficient. The Hepler’s constant and first temperature derivative of B-coefficients (dB/dT) has been used to analyze whether solute acts as structure maker or structure breaker in the solution.

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