Stochastic behavior and stirring rate effects in the chlorite-iodide reaction

I. Nagypál, Irving R. Epstein

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

The autocatalytic reaction between chlorite and iodide ions in a closed system is a clock reaction, showing a sudden appearance of brown I2 followed by a rapid disappearance of the color. Under certain conditions, the reaction time displays a striking irreproducibility. This stochastic behavior is studied potentiometrically and spectrophotometrically as a function of initial [I-], stirring rate and solution volume. The results imply that the irreproducibility is an inherent feature of the reaction generated by fluctuations in the solution after it is "well mixed." The key contributors to the stochasticity are local concentration inhomogeneities resulting from imperfect stirring and the "supercatalytic" reaction kinetics. A qualitative explanation is given that incorporates these aspects.

Original languageEnglish
Pages (from-to)6925-6928
Number of pages4
JournalThe Journal of Chemical Physics
Volume89
Issue number11
Publication statusPublished - 1988

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Iodides
stirring
iodides
Reaction kinetics
Clocks
Ions
Color
reaction time
clocks
inhomogeneity
reaction kinetics
color
chlorite
ions

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Stochastic behavior and stirring rate effects in the chlorite-iodide reaction. / Nagypál, I.; Epstein, Irving R.

In: The Journal of Chemical Physics, Vol. 89, No. 11, 1988, p. 6925-6928.

Research output: Contribution to journalArticle

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