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  Home > JCE Print > Journal of Chemical Education > Issues > 2002  > August  >
In the Classroom
Tested Demonstrations
Cobalt Alums. A Demonstration Experiment
Claus E. Schäffer and Poul Steenberg
Department of Inorganic Chemistry, University of Copenhagen, DK 2100 Copenhagen, Denmark

checked by: Wayne Wolsey and Erica Nostrom
Department of Chemistry, Macalaster College, St. Paul, MN 55105-1899

Cover
August 2002
Vol. 79 No. 8
p. 958
Abstract
The demonstration experiment describes the isolation of [Co(H2O)6]3+ both as the pure blue crystalline cesium cobalt alum, CsCo(SO4)2·12H2O, and as a light greenish-blue solid solution of ammonium cobalt alum in (NH4)Al(SO4)2·12H2O. The hexaaquacobalt(III) ion is prepared chemically by oxidation with hydrogen peroxide, taking advantage of the stabilization of CoIII relative to CoII by complexation with the carbonate ligand. A brief description of alum structure and a characterization of alum subclasses are included.
More Information
*  Citation
 Schäffer, Claus E.; Steenberg, Paul. J. Chem. Educ. 2002 79 958.
*  Keywords
 Aqueous Solution Chemistry; Coordination Chemistry; Demonstrations; Inorganic Chemistry; Inorganic Synthesis
*  History
 Created:
Last Updated:		 July 23, 2002
March 16, 2005
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