SOLID-SOLUTE PHASE-EQUILIBRIA IN AQUEOUS-SOLUTIONS .9. THERMODYNAMIC ANALYSIS OF SOLUBILITY MEASUREMENTS - LA(OH)(M)(CO3)(Q)CENTER-DOT-RH(2)O

被引：0

作者：

GAMSJAGER, H ^{[1
]}

MARHOLD, H ^{[1
]}

KONIGSBERGER, E ^{[1
]}

TSAI, YJ ^{[1
]}

KOLMER, H ^{[1
]}

机构：

[1] GRAZ TECH UNIV,INST TECH GEOL & ANGEW MINERAL,A-8010 GRAZ,AUSTRIA

来源：

ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES | 1995年 / 50卷 / 01期

关键词：

SOLUBILITY; CARBONATES; LANTHANUM; THERMODYNAMICS; PITZER MODEL;

D O I：

暂无

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 aqueous solubilities of La(OH)0.8(CO3)(1.1).0.1H(2)O, basic lanthanum carbonate of ancylite type, have been investigated as a function of ionic strength at 25.0 degrees C. The stoichiometric solubility constants defined by log*K-ps0(I) = log[La3+] + 1.1 log p(CO2) - 3 log[H+] have the values 11.10, 11.32, 11.42, 11.63, and 11.70 for I = 0.1, 0.25, 1.0, 2.0, and 4.0 mol kg(-1) (Na)ClO4 respectively. The extrapolation to infinite dilution using the Pitzer equations resulted in a ''thermodynamic'' solubility constant, log*K-pz0(0) = 10.48 +/- 0.08. This in turn led to the Gibbs energy of ancylite formation: Delta(f)G(298)(Theta){La(OH)0.8(CO3)(1.1).0.1H(2)O} = - 1.531.5 kJ mol(-1).

引用

页码：59 / 64

页数：6