THERMODYNAMICS OF CARBONATE IN AQUEOUS GL UCOSE SOLUTION .1. THE SYSTEM OF CO2-NAHCO3-NACL-GLUCOSE-H2O

The emf values for the cell without liquid junction: Pt, (1-x)H2+xCO2\ NaHCO3 (m1), NaCl (m2), CO2 (m3), Glucose (m4)\AgCl-Ag have been measu red over a broad range of ionic strength at 278.15 to 318.15 K. The va lues of acidic constants of CO2, pK1(0), in aqueous glucose solution h ave been determined from the precese emf measurements by the both meth ods: improved Harned's extrapolation and the polynomial approximation proposed by us. The values of pK1(0) obtained the both methods are in good agreement within experimental error. The dependence of first acid ic constant on temperature is given as a empirical equation: pK1(0)=A1 +A2/T+A3T. The thermodynamic quatities of first dissociation process O f CO2 in the aqueous glucose solution have been calculated, and the re sults have been discussed.