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On the "Abnormal" Decomposition Potentials of Aqueous Solutions of Halogen Acids

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Yi Liang and Jie Chen

Department of Fine Chemical Engineering, Wuhan Institute of Chemical Technology, Wuhan, Hubei 430074, PEOPLE''S REPUBLIC OF CHINA

Songsheng Qu

Department of Chemistry, Wuhan University, Wuhan, Hubei 430072, PEOPLE''S REPUBLIC OF CHINA

J. Chem. Educ., 1999, 76 (3), p 444

DOI: 10.1021/ed076p444

Publication Date (Web): March 1, 1999

Abstract

A new explanation of the "abnormal" decomposition potentials (ed) of aqueous solutions of halogen acids (hydrochloric, hydrobromic, and hydriodic acids) is proposed in this paper. It is suggested that the disproportionation reactions of these halogen acids in aqueous solutions are responsible for their abnormal decomposition potentials and that textbooks should use sulfuric acid as an example to explain the concept of ed.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Physical Chemistry

Keywords (Pedagogy):

Textbooks / Reference Books

Keywords (Subject):

Electrochemistry

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This article has been cited by 1 ACS Journal articles (1 most recent appear below).

Abnormal Decomposition Potentials Reconsidered—A Corrected Treatment
Cynthia G. Zoski , Allen J. Bard
Journal of Chemical Education2000 77 (4), 526
- Abnormal Decomposition Potentials Reconsidered—A Corrected Treatment
  Cynthia G. Zoski , Allen J. Bard
  Journal of Chemical Education2000 77 (4), 526
  The concept of "abnormal decomposition potential" as described by Liang et al. (J. Chem. Educ. 1999, 76, 444) is imprecise and of little relevance in modern electrochemistry. Complete current-potential curves can be calculated and they show why such ...
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