Isopiestic Determination of the Osmotic and Activity Coefficients of K2HPO4(aq), Including Saturated and Supersaturated Solutions, at T=298.15 K

被引：21
|
作者：
Popovic, Daniela Z. [1 ]
Miladinovic, Jelena [1 ]
Todorovic, Milica D. [1 ]
Zrilic, Milorad M. [1 ]
Rard, Joseph A.
机构：
[1] Univ Belgrade, Fac Technol & Met, Belgrade 11001, Serbia
来源：
JOURNAL OF SOLUTION CHEMISTRY | 2011年 / 40卷 / 05期
关键词：
Aqueous solutions; Isopiestic measurements; K2HPO4; Osmotic coefficients; Activity coefficients; Solubility; THERMODYNAMIC PROPERTIES; AQUEOUS-SOLUTIONS; PHOSPHORIC-ACID; TEMPERATURES; PHOSPHATE; SYSTEM;
D O I：
10.1007/s10953-011-9650-1
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The osmotic coefficients of K2HPO4(aq) have been measured at T=298.15 K by the isopiestic vapor pressure method over the range of molalities from 1.3846 mola <...kg(-1) to 13.939 mola <...kg(-1) (oversaturation) with CaCl2(aq) as the reference solution. The molalities and osmotic coefficients of saturated solutions in equilibrium with K(2)HPO(4)a <...xH(2)O(cr) were measured simultaneously by the same method. Available literature osmotic coefficients of K2HPO4(aq) at T=298.15 K, and our new experimental data, were combined and modeled using an extended form of Pitzer's equation and the Clegg-Pitzer-Brimblecombe equation based on the mole-fraction-composition scale. These equations were used to calculate the activity coefficients of K2HPO4(aq) at T=298.15 K.
引用
收藏
页码：907 / 920
页数：14
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