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Citation: Zhang Zi-Fu, Yang Jia-Zhen, Yang Qi-Zhi, Yang Yong-Zhen, Liu Wei, Li Hui. Thermodynamics of the Dissociation of Weak Electrolyte in Mixed Solvents(I)[J]. Acta Physico-Chimica Sinica, ;1993, 9(05): 668-674. doi: 10.3866/PKU.WHXB19930518 shu

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

1.
Department of Chemistry Liaoning University, Shenyang 110036

Received Date: 21 February 1992
Available Online: 15 October 1993

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.
- Absorption spectra; Isosbestic point; Dissociation constant; Pitzers equation; Indicator; Bromophenal blue
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