物理化学学报 >> 1993, Vol. 9 >> Issue (05): 668-674.doi: 10.3866/PKU.WHXB19930518

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混合溶剂中弱电解质解离热力学(I)

张子富; 杨家振; 杨齐志; 杨永珍; 刘伟; 李辉   

  1. 辽宁大学化学系，测试中心，沈阳 110036
  • 收稿日期:1992-02-21 修回日期:1992-07-24 发布日期:1993-10-15
  • 通讯作者: 杨家振

Thermodynamics of the Dissociation of Weak Electrolyte in Mixed Solvents(I)

Zhang Zi-Fu; Yang Jia-Zhen; Yang Qi-Zhi; Yang Yong-Zhen; Liu Wei; Li Hui   

  1. Department of Chemistry Liaoning University, Shenyang 110036
  • Received:1992-02-21 Revised:1992-07-24 Published:1993-10-15
  • Contact: Yang Jia-Zhen

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关键词: Absorption spectra; Isosbestic point; Dissociation constant; Pitzers equation; Indicator; Bromophenal blue

Abstract:

The dissociation degrees of bromophenol blue at various total ionic strengths in pure water and in 15%, 25 mass% ethanol-water mixed solvents were measured by U-3200 spectrophotometer, and the pH values of corresponding solution were also measured by Orion EA 940 ionometer. The thermodynamic dissociation constants of bromophenol blue in pure water and in the mixed solvents were determined by two methods: extrapolation and polynomial approximation. The effect of medium on absorption spectra of bromophenol blue was discussed.

Key words: Absorption spectra; Isosbestic point; Dissociation constant; Pitzers equation; Indicator; Bromophenal blue