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  Home > JCE Print > Journal of Chemical Education > Issues > 1999  > July  >
In the Classroom
Tested Demonstrations
A Further Demonstration of Sulfite-Induced Redox Cycling of Metal Ions Initiated by Shaking
submitted by: Horacio D. Moya and Eduardo Almeida Neves
Departmento de Química, Universidade Federal De São Paulo C.P. 26077, CEP 05599-970 São Paulo SP Brazil

submitted by: Nina Coichev
Instituto de Química, Universidade de São Paulo, C.P. 26077, CEP 05599-970 São Paulo SP Brazil

checked by: Jim Niewahner
Department of Chemistry, Northern Kentucky University, Highland Heights, KY 41099-1905

Cover
July 1999
Vol. 76 No. 7
p. 930
Abstract
Details of a fascinating laboratory demonstration of the sulfite-induced redox cycling of Ni(II)/Ni(III), which is initiated by shaking the solution in the presence of air, are reported. The balance between the sulfite and oxygen concentration controls the direction of the overall reaction. The dissolved oxygen is used during the rapid sulfite-induced oxidation of the metal ion or complex, as well as during the subsequent reduction by sulfite and the oxidation of sulfite to sulfate. Shaking the solution in the presence of air restores the dissolved oxygen concentration, and the oxidation-reduction cycle occurs again.
More Information
*  Citation
 Moya, Horacio D.; Neves, Eduardo Almeida; Coichev, Nina. J. Chem. Educ. 1999 76 930.
*  Keywords
 Demonstrations; Inorganic Chemistry; Environmental Chemistry; Redox Reactions; Nickel; sulfite
*  History
 Created:
Last Updated:		 June 9, 1999
June 23, 2005
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