Issue 18, 2000
From the journal:

Physical Chemistry Chemical Physics

Kinetics of the Dushman reaction at low I− concentrations

G. Schmitza  

a Faculté des Sciences Appliquées, Uniersité Libre de Bruxelles, A.F.Rooseelt, 50, B-1050, Bruxelles, Belgium
E-mail: gschmitz@ulb.ac.be

Abstract

We have reinvestigated the kinetics of the Dushman reaction, IO3−+5 I−+6 H+→3 I2+3 H2O, under the conditions of the oscillating Bray–Liebhafsky reaction, perchloric acid solutions and low iodide concentrations, using a CSTR (continuous flow stirred tank reactor) and an iodide ion selective electrode. We show that it is possible to get meaningful results with this electrode at iodide concentrations in the range [I−]=5×10−8 to 5×10−6 M. The experimental rate law is r=[IO3−][H+]2 {k′[I−]+k″[I−]2} with k′=(1200±150) M−3 s−1 and k″=(4.2±0.8)×108 M−4 s−1 at 25°C and 0.2 M ionic strength. It is the first time that the two terms, first and second order in [I−], are observed simultaneously.

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Article information

DOI
https://doi.org/10.1039/B003606O
Article type
Paper
Submitted
05 May 2000
Accepted
27 Jun 2000
First published
15 Aug 2000

Phys. Chem. Chem. Phys., 2000,2, 4041-4044

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Kinetics of the Dushman reaction at low I− concentrations

G. Schmitz, Phys. Chem. Chem. Phys., 2000, 2, 4041 DOI: 10.1039/B003606O

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