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  Home > JCE Print > Journal of Chemical Education > Issues > 1997  > July  >
Chemical Education Today
Letters
Double Redox Reactions
Zoltán Tóth
Lajos Kossuth University, H-4010 Debrecen, PO Box 66, Hungary
Cover
July 1997
Vol. 74 No. 7
p. 744
Full Text
Cardinali et al. proposed an interesting procedure to balance double disproportionations (J. Chem. Educ. 1995, 72, 716). The combination of two reactions containing suitable "extraneous" species as co-reactant and co-product can be used to balance not only "pure" double disproportionations, but double redox reactions, too. For example, we can balance the equation

KI + H2O + C2H5OH --> K2CO3 + H2 + CHI3

by introducing KOH as "extraneous" species into the two redox reactions between C2H5OH and H2O:

C2H5OH + H2O + 4KOH = 2K2CO3 + 6H2

C2H5OH + 6KI + 5H2O = 2CHI3 + 4H2 + 6KOH

After eliminating the "extraneous" species KOH, we obtain the balanced redox equation:

5C2H5OH + 12KI + 13H2O = 6K2CO3 + 26H2 + 4CHI3

See author's reply.
More Information
*  Citation
 Tóth, Zoltán. J. Chem. Educ. 1997 74 744.
*  Keywords
 Redox Reactions
*  History
 Created:
Last Updated:		 July 28, 1999
June 23, 2005
Link to Author's Reply added (May 2004). Link to Article added (August 2004).
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