Detailed Studies of Propagating Fronts in the Iodate Oxidation of Arsenous Acid

Adel Hanna, Alan Saul, Kenneth Showalter

Research output: Contribution to journalArticle

183 Scopus citations

Abstract

In an unstirred thin film of solution containing iodate and arsenous acid, a single propagating wave of chemical reactivity may be exhibited. The wave converts the solution from colorless to blue in reaction mixtures containing iodate in stoichiometric excess and starch indicator. The wave appears as a narrow blue band propagating through a colorless solution in reaction mixtures containing arsenous acid in stoichiometric excess. Waves were electrochemically initiated and propagation velocity was measured as a function of reactant concentrations. Iodide concentration was measured with an iodide selective microelectrode as a wave passed through the electrode position. The reaction-diffusion behavior is explained with a simple reaction mechanism autocatalytic in iodide.

Original languageEnglish (US)
Pages (from-to)3838-3844
Number of pages7
JournalJournal of the American Chemical Society
Volume104
Issue number14
DOIs
StatePublished - Jan 1 1982
Externally publishedYes

    Fingerprint

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this