高等学校化学学报 ›› 1990, Vol. 11 ›› Issue (11): 1263.

• 研究论文 • 上一篇    下一篇

无量纲参数法对络合反应化学平衡的研究

曾宪诚, 张元勤, 邓郁   

  1. 四川大学化学系, 610064
  • 收稿日期:1989-04-19 出版日期:1990-11-24 发布日期:1990-11-24
  • 通讯作者: 曾宪诚

Studies on Chemical Equilibrium of the Complex Reaction with the Method of Dimensionless Parameter

Zeng Xiancheng, Zhang Yuanqin, Deng Yu   

  1. Department of Chemistry, Sichuan Universtiy, Chengdu, 610064
  • Received:1989-04-19 Online:1990-11-24 Published:1990-11-24

摘要: 本文应用可逆反应的热静力学无量纲参数法,研究了二苯并-18-冠-6与金属钠离子在“800/200(V/V)”DMSO-H2O混合溶剂中的络合反应。直接测定了反应的焓变和平衡常数,讨论了这种方法的适用范围,建立了测定平衡常数的相对误差表示式并提出了用外推法求Ka的基本要求。

关键词: 热静力学, 无量纲参数法, 络合反应, 冠醚, 金属离子

Abstract: The method of dimensionless parameter of thermostatics for (2-1) type reversible reaction suggested in literatures was used to study the complex reaction of dibenzo-.18-crown-6 with sodium ion in DMSO-H2O mixed solvents (800/200(V/V)) at 25. 0 and 30. 0℃ respectively.The enthalpy change and equilibrium constant of the reaction were directly measured. The applicable range of the method is discussed. The basic requirement for evaluating equilibrium constant Ka with extrapolation is also proposed in this paper.

Key words: Thermostatics, Method of dimensionless parameter, Complex reaction, Crown ether, Metal ion

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