Thermodynamics of electrolytes.: 13.: Ionic strength dependence of higher-order terms;: Equations for CaCl2 and MgCl2

被引：78

作者：

Pitzer, KS

Wang, PM

Rard, JA

Clegg, SL

机构：

[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[3] Univ Calif Lawrence Livermore Natl Lab, Geosci & Environm Technol Earth & Environm Sci Di, Livermore, CA 94550 USA

[4] Univ E Anglia, Sch Environm Sci, Norwich NR4 7TJ, Norfolk, England

来源：

JOURNAL OF SOLUTION CHEMISTRY | 1999年 / 28卷 / 04期

基金：

英国自然环境研究理事会;

关键词：

electrolyte solutions; osmotic coefficient; activity coefficient; thermodynamics; calcium chloride; magnesium chloride;

D O I：

10.1023/A:1022695525943

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：

While the original ion-interaction (Pitzer) equations of 1973 were adequate for many electrolytes to the limit of solubility, additional terms are needed for some systems of large solubility. A simple pattern of ionic-strength dependence is proposed for third, fourth, and higher virial coefficients. It is found to be very effective in representing the complex behavior of CaCl2(aq) as well as that of MgCl2(aq) at 25 degrees C. Equations without ion association are presented for each system that are valid for the full range to 11.0 and 5.9 mol-kg(-1), respectively, as well as simpler equations for limited molality ranges.

引用

页码：265 / 282

页数：18