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Kinetics and mechanism of oxidation of indigo carmine by hypohalites

✍ Scribed by Puttaswamy; D. S. Mahadevappa; N. M. Made Gowda

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
413 KB
Volume
23
Category
Article
ISSN
0538-8066

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✦ Synopsis

Kinetics of oxidation of indigo carmine (IC) by sodium hypohalites, NaOX (X = C1 or Br), in alkaline buffer of pH 9-11 has been studied spectrophotometrically at A = 610 nm. The experimental rate law obtained is -

d[IC]/dt = k[OX-][IC][OH-1"

where z < 1. Variation of ionic strength or dielectric constant of the medium had no effect on the reaction rate while the addition of halide ions slightly retarded the rate. A most plausible mechanism proposed on the basis of experimental results involves the formation of isatin sulphonate which undergoes further oxidation to anthranilate. Activation parameters have been evaluated.

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