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Kinetics of the reaction between hexacyanoferrate(III) and thiosulphate ions. The initial reaction

✍ Scribed by K.E. Howlett; B.L. Wedzicha

Publisher: Elsevier Science
Year: 1976
Tongue: English
Weight: 500 KB
Volume: 18
Category: Article
ISSN: 0020-1693
DOI: 10.1016/s0020-1693(00)95592-0

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✦ Synopsis

The kinetics of the reaction between hexacyanoferrate(IIl) and thiosulphate in aqueous solution have been investigated spectrophotometrically. The rate equation contains several terms. Results on the first few percent of reaction only are analysed here. The total initial rate consists of an uncatalysed part, viz. -d[Fe (CN),&]ldt = 38[H+][S,O,"]' mol t-' min-' at 298" K together with components caused by catalysis by acetate and by cations. The mechanistic reasons for this are investigated and the uncatalysed path is shown to correspond in rate to the decomposition of thiosulphate.

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