Kinetics and mechanism of the reaction between hypochlorous acid and tetrathionate ion

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The reaction has been studied spectrophotometrically monitoring the absorbance in the 240-400 nm wavelength range. The spectra of the reactants, intermediates, and products in this system are overlapping; thus special programs have been used (and tested) to unravel the kinetics and mechanism of the reaction. The stoichiometry of the reaction in excess hypochlorous acid is S4O62-+7HOCl+3H2O+4SO42 - +7Cl-+13H+. Various experiments are presented to show that - in excess tetrathionate - the reaction produces a light-absorbing intermediate identified as S2O3Cl-. The intermediate slowly hydrolyzes into sulfur and sulfate and it yields pentathionate in excess tetrathionate. The rate-determining steps and their rate constants are given.

Original languageEnglish
Pages (from-to)395-402
Number of pages8
JournalInternational Journal of Chemical Kinetics
Issue number7
Publication statusPublished - Jan 1 2000


ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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