Solubilities of amorphous FeAs precipitates

The solubilities of amorphous FeAs precipitates were found to be lower than those reported by earlier authors for apparently amorphous ferric arsenate. Data obtained with our samples (pH 6, Fe As = 3.1 ; pH 6, Fe As = 5.9 ; pH 6, Fe As = 14.4 ; pH 8, Fe As = 3.1 ; and pH 10, Fe As = 5.9 ) were used...

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Bibliographic Details
Published in:Hydrometallurgy 1995-07, Vol.38 (2), p.111-123
Main Authors: Virčíková, Edita, Molnár, Ľudovít, Lech, Peter, Reitznerová, Eva
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Solubility
Solutions
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Summary:The solubilities of amorphous FeAs precipitates were found to be lower than those reported by earlier authors for apparently amorphous ferric arsenate. Data obtained with our samples (pH 6, Fe As = 3.1 ; pH 6, Fe As = 5.9 ; pH 6, Fe As = 14.4 ; pH 8, Fe As = 3.1 ; and pH 10, Fe As = 5.9 ) were used to calculate the solubility product at 23°C as K sp, (Fe 3+ AsO 4 3− = 10 −24.45 and for the calculation of free energy of formation as ΔG° (f) = −1277.68 kJ·mol −1. Our values correspond with those calculated for crystalline scorodite K sp (Fe 3+ AsO 4 3−) = 10 −24.41 ± 0.15 and ΔG° (f) = −1279.2 kJ · mol −1 published by Krause and Ettel.
ISSN:0304-386X
1879-1158
DOI:10.1016/0304-386X(94)00072-B