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Kinetics of oxidation of indigo carmine by N-sodio-N-bromotoluenesulfonamide in acidic buffer medium

✍ Scribed by S. Ananda; M. B. Jagadeesha; B. M. Venkatesha; N. M. Made Gowda

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 151 KB
Volume: 29
Category: Article
ISSN: 0538-8066
DOI: 10.1002/(sici)1097-4601(1997)29:6<453::aid-kin7>3.0.co;2-t

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✦ Synopsis

The kinetics of oxidation of indigo carmine (IC) by N-sodio-N-bromotoluenesulfonamide or bromamine-T (BAT) in pH 5 buffer medium has been investigated at 30°C using spectrophotometry at 610 nm. The reaction rate shows dependencies of first-order on [IC] 0 , second-order on [BAT] 0 , fractional order on [H ϩ ], and inverse first-order on [p-toluenesulfonamide]. The addition of chloride and bromide ions, and the variation of ionic strength of the medium have no influence on the reaction rate. There is a negative effect of the dielectric constant of the solvent. Activation parameters have been calculated. A single-pathway mechanism for the reaction, consistent with the kinetic data, has been proposed.

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