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Synergetics pp 51-56 | Cite as

Etude cinétique de la réaction de Bray

  • G. Schmitz
  • H. Rooze
Conference paper
  • 227 Downloads
Part of the Springer Series in Synergetics book series (SSSYN, volume 3)

Abstract

The kinetics of the BRAY reaction (hydrogen peroxide decomposition catalysed by the iodate-iodine couple) has been studied in a closed reactor provided with a pump circulating the solution through the cell of spectrophotometer. The measures have been done in the following conditions:
$$\begin{array}{l} {\left[ {{H_2}{O_2}} \right]_o} = 1.1M\quad ;\;{\left[ {KI{O_3}} \right]_o} = .019M \\ {\left[ {C{H_2}{{\left( {COOH} \right)}_2}} \right]_o} = .013m\quad ;\;{\left[ {MnS{O_4}} \right]_o} - .004M \\ {\left[ {HCl{O_4}} \right]_o} = .057M\quad ;\;T = 25^\circ C\;;\;\tau = 4.8\min \\ \end{array}$$

The rate of iodine formation, the maximum concentration reached during a period, the rate of iodine decomposition and the minimum concentration reached have been measured. These values have been correlated with the concentrations of iodate (near constant) of hydrogen peroxide (measured calorimetrically in samples taken during the oscillations) and of iodide (measured with an Orion selective electrode).

The results obtained are discussed according to a kinetic scheme based on the mechanism of the iodate-iodide-iodine reaction. This mechanism has been completed with the reactions of hydrogen peroxide as simply as possible in order to explain the origin of the oscillations without introducing unrelated complications.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1979

Authors and Affiliations

  • G. Schmitz
  • H. Rooze

There are no affiliations available

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