LAUSR

Abstract The present work deals with experimental determination of density, speed of sound and viscosity (ƞ) data for L-valine and L-isoleucine in aqueous [Emim][HSO4] over range of concentration (0.0301-0.0702) mol kg-1 and temperature (293.15-313.15 K). The density and speed of sound data are used to evaluate the volumetric and compressibility parameters. Through the graphical fitting of the evaluated parameters in some standard relations the limiting apparent molar volume ( V o ϕ ) and Limiting apparent molar isentropic compression ( K ° ϕ , s ) are calculated. The transfer parameters of volume ( Δ tr V ° ϕ ) and compressibility ( Δ tr K ° ϕ , S ) studies evaluated using the limiting apparent 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 ( η r ) and viscosity B-coefficient. The Helper’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.