葡萄糖水溶液中碳酸盐热力学研究 1.二氧化碳-碳酸氢钠-氯化钠-葡萄糖-水体系

在278.15～318.15K和一定离子强度范围内,测定了无液接电池Pt,(1-x)H~2+xCO~2│NaHCO~3(m~1),NaCl(M~2),.CO~2(m~3),葡萄糖(m~4)│AgCl-Ag的电动势,利用改进的Harned外推法和我们提出的多项式拟合法确定了二氧化碳在15%葡萄糖水溶液中的一级酸常数K 两种方法所得PK 值在实验误差范围内一致.PK 随温度变化符合经验方程PK =A~1+A~2/T+A~3T,并计算了二氧化碳在葡萄糖水溶液中解离过程的各热力学量.

Thermodynamics of carbonate in aqueous glucose solution.1.the system of CO~2-NaHCO~3-NaCl glucose-H~2O

The values of the acidic constants of CO2, pK01, in aqueous glucose solution were determine from emf measurements utilizing an improved Harned extrapolation and the polynomial approximation proposed by the authors. The values of pK01 obtained by both methods are in agreement with experimental methods. The dependence of first acidic constant on temperature is given by the empirical equation pK01 = A1 + A2/T + A3/T. The thermodn. of the first dissociation of CO2 in aqueous glucose solution were calculated