高等学校化学学报 ›› 1990, Vol. 11 ›› Issue (2): 180.

• 研究论文 • 上一篇    下一篇

混合溶剂中氨基酸热力学性质的研究(Ⅰ)—278.15~318.15K下甘氨酸-1,2-丙二醇-水体系

杨家振, 张犁天, 门殿元, 梁春余, 贺立敏, 孙爱莲   

  1. 辽宁大学化学系
  • 收稿日期:1988-05-17 出版日期:1990-02-24 发布日期:1990-02-24
  • 通讯作者: 杨家振
  • 基金资助:

    国家自然科学基金

Studies on Thermodynamics of the Dissociation of Amino Acid in Mixed Solvents ( Ⅰ ) —Glycine-1,2-Propanediol-Water System at278.15-318. 15 K

Yang Jiazhen, Zhang Litian, Men Dianyuan, Liang Chunyu, He Limin, Sun Ailian   

  1. Department of Chemistry, Liaonang University, Shenyang
  • Received:1988-05-17 Online:1990-02-24 Published:1990-02-24

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。

关键词: Pitzer方程, 甘氨酸, 解离常数, 混合溶剂, 电动势

Abstract: The two thermodynamic dissociation constants of glycine at 5 different temperatures from 278.15 to 318.15 Kin 0.05 mole fraction 1,2-propanediol-water mixed solvent were determined from precise EMFmeasurements 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 Tby empirical pK = A1/(T+A2+A3T). The thermodynamic quantities of dissociation in the mixed solvent are calculated and the results are discussed.

Key words: Pitzer equation, Glycine, Dossociation constant, Mixed solvent, Electromotive force

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