Apparent molar volume, viscosity B-coefficient, and adiabatic compressibility of tetrabutylammonium bromide in aqueous ascorbic acid solutions at T = 298.15, 308.15, and 318.15 K

Abstract

Apparent molar volumes ϕν and viscosity B-coefficients for tetrabutyl ammonium bromide (TBAB) in (0.00, 0.05, 0.10, and 0.15) mol dm−3 aqueous ascorbic acid solutions have been determined from solution density and viscosity measurements at temperatures over the range 298.15 to 318.15 K as function of concentration of ascorbic acid solutions. In the investigated temperature range, the relation: ϕν0 = a0 + a1T + a2T2, have been used to describe the partial molar volume ϕν0. These results, in conjunction with the results obtained in pure water, have been used to calculate the standard volumes of transfer Δϕν0 and viscosity B-coefficients of transfer for TBAB from water to aqueous ascorbic acid solutions for rationalizing various interactions in the ternary solutions. The structure making or breaking ability of TBAB has been discussed in terms of the sign of (δ2ϕν0/δT2)P. An increase in the transfer volume of TBAB with increasing ascorbic acid concentration has been explained by Friedman-Krishnan co-sphere model. The activation parameters of viscous flow for the ternary solutions studied have also been calculated and explained by the application of transition state theory.