ACTIVITY AND SPECTROSCOPIC ANALYSIS OF CONCENTRATED-SOLUTIONS OF K2S

被引：28

作者：

PERAMUNAGE, D ^{[1
]}

FOROUZAN, F ^{[1
]}

LICHT, S ^{[1
]}

机构：

[1] CLARK UNIV,DEPT CHEM,WORCESTER,MA 01610

来源：

ANALYTICAL CHEMISTRY | 1994年 / 66卷 / 03期

关键词：

D O I：

10.1021/ac00075a011

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The determination of activity of highly concentrated sulfide solutions is important for the thermodynamic analysis of speciation. A novel ''evanescent'' method for solvent analysis and determination of mean solution activities is applied to measure the first activity coefficients of highly concentrated sulfide solutions. Another technique, submicrometer path length spectroscopy, provides in situ observations of the problematic alkaline sulfide equilibria in the domain of highly concentrated sulfide. Combined, these methods provide an upper bound estimate for the second acid dissociation equilibrium of hydrogen sulfide of pK(2) > 17.3(+/-0.1) and the free energy of formation far sulfide of Delta G degrees (S2-)(aq) > 111 (+/-0.5) kJ/mol.

引用

页码：378 / 383

页数：6

共 29 条

[1] THERMODYNAMICS OF AQUEOUS SOLUTIONS OF POTASSIUM HYDROXIDE [J].