STUDY OF THE COMPLEXATION AND PRECIPITATION EQUILIBRIA IN THE SYSTEM CR(VI)-FE(III)-H2O

Authors
OLAZABAL MA ETXEBARRIA N FERNANDEZ LA MADARIAGA JM
Citation
Ma. Olazabal et al., STUDY OF THE COMPLEXATION AND PRECIPITATION EQUILIBRIA IN THE SYSTEM CR(VI)-FE(III)-H2O, Journal of solution chemistry, 23(10), 1994, pp. 1111-1123
Citations number
15
Categorie Soggetti
Chemistry Physical
Journal title
Journal of solution chemistry → ACNP
ISSN journal
00959782
Volume
23
Issue
10
Year of publication
1994
Pages
1111 - 1123
Database
ISI
SICI code
0095-9782(1994)23:10<1111:SOTCAP>2.0.ZU;2-W
Abstract
Potentiometric and spectrophotomeric studies of the systems Cr(VI)-Fe( III)-H2O and Fe(III)-H2O systems have been performed. The formation of the complex FeCrO4+ is suggested and the corresponding thermodynamic formation constant has been calculated (logbeta11 = 7.77 +/- 0.02). In order to understand the cation-anion interactions, a study of the pre cipitation equilibrium between Cr(VI) and Fe(III) has been carried out . The results indicate the formation of FeOHCrO4.2Fe(OH)3, a mixed pre cipitate whose thermodynamic solubility product is pK(so) = 99.8 +/- 0 .2.