Osmotic and activity coefficients of dilute aqueous solutions of the series Me4Ni to MeBu3NI at 298.15 K

被引：9
|
作者：
Blanco, Luis H. [2 ]
Amado, G. Eliseo [1 ]
Calvo, Julio C. [3 ]
机构：
[1] Univ Pamplona, IBEAR, Dept Chem, Km 1 Via Bucaramanga, Pamplona, Colombia
[2] Univ Nacl Colombia, LIB, Bogota, Colombia
[3] Univ Dist Francisco Jose de Caldas, Bogota, Colombia
来源：
FLUID PHASE EQUILIBRIA | 2008年 / 268卷 / 1-2期
关键词：
isopiestic method; osmotic coefficients; aqueous systems; unsymmetrical tetra-alkyl-ammonium iodides; Pitzer model; ion-ion interactions; ion-solvent interactions;
D O I：
10.1016/j.fluid.2008.04.008
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Osmotic coefficients of dilute aqueous solutions of Me4NI, Me3BuNI, Me2BU2NI and MeBu3NI were determined by the isopiestic method at 298.15K. A gravimetric isopiestic vapor pressure technique was used. The osmotic coefficients of tetra-alkyl-ammonium solutions were analyzed with the Debye-Huckel limiting law. The results show that the osmotic coefficient varies in the following way: Me4NI>MeBu3NI>Me2Bu2NI>Me3BuNI. The negative deviation of activity coefficients values from the Debye-Huckel limiting law was interpreted in terms of ion-pair formation. The set of Pitzer parameters b = 1.2 and eel = 2.0 was used. The results were fitted to the Pitzer model and the parameters beta(0), beta(1) and C phi were calculated. beta(0) and beta(1) were analyzed in terms of ion-ion interactions and ion-solvent interactions. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：90 / 94
页数：5
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