Activity Coefficients in Quaternary Systems at 298.15 K: RbCl + MeOH + EtOH + H2O and CsCl + MeOH + EtOH + H2O Systems

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• 作者：Yanping Du ; Shu鈥檔i Li ; Quanguo Zhai ; Yucheng Jiang ; Mancheng Hu
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2013
• 出版时间：September 12, 2013
• 年：2013
• 卷：58
• 期：9
• 页码：2545-2551
• 全文大小：301K
• 年卷期：v.58,no.9(September 12, 2013)
• ISSN：1520-5134

文摘

Activity coefficients of RbCl or CsCl in methanol + ethanol + water were determined at 298.15 K by the cells containing ion-selective electrodes (ISEs). The molalities of RbCl and CsCl are up to approximately 1 mol路kg^鈥? in the mixed solvents, and the mass fractions of five aqueous MeOH/EtOH mixtures studied were (5/5, 10/5, 5/10, 10/10, and 15/15) %. The experimental data were optimized using the extended Debye鈥揌眉ckel, the Pitzer, and the modified Pitzer equations. The results of the apparent standard electromotive force E⁰* of the three equations are in good agreement. The mean activity coefficients and the standard Gibbs energy of transfer of RbCl or CsCl from pure water to mixed solvents (MeOH + EtOH + water) were also calculated.