Journal of Chemical and Engineering Data, Vol.49, No.5, 1185-1188, 2004
Determination of activity coefficients, osmotic coefficients, and excess Gibbs free energies of HCl in N,N-dimethylformamide-water mixed solvent systems by potentiometric measurements
Mean activity coefficients (gamma(+/-)), osmotic coefficients (rho), and excess Gibbs free energies (G(E)) of HCl in mixed-solvent systems containing (0, 0.1, 0.2, 0.3, and 0.4) mass fractions (w) of N,N-dimethylformamide (DMF) in water were determined at 25 degreesC using the Pitzer ion-interaction model. These parameters were obtained from the experimental potentiometric data of the galvanic cell Ag\AgCl\HCl(m), DMF(w), H(2)O(1 - w)\H(+)(glass membrane ISE) over the molality range from dilute solution to about 4 mol/kg in these mixed-solvent systems.