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Kinetic studies on the formation of metal chelates. IV. Formation of chromium(III)‐ethylenediaminetetraacetate complexes from tris (oxalato)chromate(III) and ethylenediaminetetraacetate in alkaline media
Author(s) -
Banerjea D.,
Chaudhuri P.
Publication year - 1970
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19703720219
Subject(s) - chemistry , chromium , chromate conversion coating , chelation , ionic strength , tris , metal , inorganic chemistry , ion , aqueous solution , organic chemistry , biochemistry
The rate of formation of Cr(III)‐EDTA complexes from Cr(C 2 O 4 ) 3 3−and EDTA at pH ca. 8–9.5 has been determined spectrophotometrically. From the observed dependence of the rate on pH and EDTA concentration a probable mechanism has been suggested for the overall change involving two concurrent paths; corresponding δH ≠ and δS ≠ values have also been determined. An increase in ionic strength has been found to increase the overall rate as well as that of each individual path as is expected in a reaction between ions of the same charge type.