摘要
本文测定了278.15～318.15K范围内5个温度下的无液接电池(A)和(B)的电动势。恒定1,2-丙二醇在混合溶剂中的摩尔分数为0.05。用本文提出的多项式逼近法,确定了甘氨酸第一、第二热力学解离常数并计算了相应的热力学量。
The two thermodynamic dissociation constants of glycine at 5 different temperatures from 278.15 to 318.15 K in 0. 05 mole fraction 1,2-propanediol-water mixed solvent were determined from precise EMF measurements hydrogen-silver chloride electrondes in cells without liguid junction by using the polynomial approach proposed in this paper on the basis of Pitzer's electrolytic solution theory. As compared with traditional extrapolation on the basis of extended Debye-Huckel equation, the results obtained from both methods are in agreement with each other. The change of the first or second dissociation constants is given as a function of the thermodynamic temperature T by empirical pK = A1/(T+A2+A3T). The thermodynamic quantities of dissociation in the mixed solvent are calculated and the results are discussed.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1990年第2期180-183,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
甘氨酸
离解常数
混合溶剂
电动势
Pitzer equation, Glycine, Dossociation constant, Mixed solvent, Electromotive force
