A Kinetic–Equilibrium Study of a Triiodide Concentration Maximum Formed by the Persulfate–Iodide Reaction
Abstract
The presence of triiodide, I 3 –, throughout the lifetime of a persulfate–iodide reaction with persulfate in excess, is controlled by an opposing effect of falling iodide concentration and rising iodine concentration. This brings triiodide to a concentration maximum, [I 3 – ] max, which can be studied by UV–visible spectroscopy using absorbance measurements taken over an extended iodine clock time-scan. Equilibrium and conservation equations can be combined so that, together with [I 3 – ] max, a value of the constant K for the equilibrium established between iodine, iodide, and the triiodide complex ion can be obtained.
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Cites
The oxidation of iodide ion by persulfate ion
Moews, P. C., & Petrucci, R. H. (1964) · Journal of Chemical Education · doi:10.1021/ed041p549 · Cited by 14 · see citing works
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- Authors
- Burgess, A. E., & Davidson, J. C.
- Affiliations
- Abertay University (GB)
- Kip McGrath Educational Centre, Highland House, St. Catherine’s Road, Perth, PH1 5YA, United Kingdom
- Corresponding author
- Burgess, Arthur E.
- Venue
- Journal of Chemical Education
- Publisher
- American Chemical Society (ACS)
- Published
- 2012-03-15
- Volume
- 89
- Issue
- 6
- Pages
- 814-816
- ISSN
- 0021-9584 (ISSN-L)
- 1938-1328
- OpenAlex
- W2052267319
- Cited by
- 41
- References
- 1
- Citations by year
- 2026: 2 · 2025: 2 · 2024: 4 · 2023: 4 · 2022: 3 · 2021: 6 · 2020: 5 · 2019: 2 · 2018: 3 · 2017: 2 · 2016: 3 · 2015: 1 · 2014: 2 · 2013: 2
- FWCI
- 1.04
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Chemical Education (publishedVersion)
- Topics
- Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Various Chemistry Research Topics
- Physical Sciences › Chemistry › Organic Chemistry › Chemical Reaction Mechanisms
- Social Sciences › Education › Chemistry Education and Research
- Keywords
- triiodide, reaction kinetics, chemical equilibrium, iodide concentration, iodine content, UV-Vis spectroscopy
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