Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

Apparent molar volumes (Vo) and viscosity B-coefficients for citric acid in (0.001, 0.003, and 0.005) mol 3 dm 3 aqueous cetrimonium bromide (N-cetyl-N,N,N-trimethyl ammonium bromide, C19H42NBr) solutions have been determined from solution density and viscosity measurements at T = (298.15, 308.15, and 318.15) K and p = 0.1 MPa as a function of the concentration of citric acid. The apparent molar volumes have been extrapolated to zero concentration to obtain the limiting values at infinite dilution (Vo 0 ), using the Redlich Meyer equation, and the obtained parameters have been interpreted in terms of solute solvent interactions. The viscosity data were analyzed using the Jones Dole equation, and the derived parameters A and B have also been interpreted in terms of solute solute and solute solvent interactions, respectively, in the mixed solutions. The structure-making or -breaking ability of the electrolyte has been discussed in terms of sign of dB/dT. The activation parameters of viscous flow for the ternary solutions studied have also been calculated and explained by the application of transition state theory.