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Solid-solute phase equilibria in aqueous solutions, VIII: The standard gibbs energy of La2(CO3)3.8H2O
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Solid-solute phase equilibria in aqueous solutions, VIII: The standard gibbs energy of La2(CO3)3.8H2O

A.M. Nguyen, E. Königsberger, H. Marhold and H. Gamsjäger
Monatshefte fur Chemie//Chemical Monthly, Vol.124(10), pp.1011-1018
1993
DOI: https://doi.org/10.1007/BF00814147
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Abstract

The solubilities of lanthanum carbonate La2(CO3)3·8H2O in solutions S0([H+]=H mol kg-1, [Na+]=(I-H) mol kg-1, [ClO4-]=I mol kg-1) at various fixed partial pressures of CO2 have been investigated at 25.0 °C. The hydrogen ion molality and the total molality of La(III) ion in equilibrium with the solid phase were determined by e.m.f. and analytical methods, respectively. The stoichiometric solubility constants {Mathematical expression} according to the overall reaction {Mathematical expression} have the values 10.23, 10.37, 10.58, 10.77 and 11.06 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: {Mathematical expression}. This in turn led to the Gibbs energy of lanthanite, La2(CO3)3·8H2O, formation: {Mathematical expression}.

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Citation topics
2 Chemistry
2.165 Nanofibers, Scaffolds & Fabrication
2.165.1082 Calcium Carbonate Crystallization
Web Of Science research areas
Chemistry, Multidisciplinary
ESI research areas
Chemistry
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