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  Home > JCE Print > Journal of Chemical Education > Issues > 2002  > August  >
In the Laboratory
Determination of the Empirical Formula of a Copper Oxide Salt Using Two Different Methods
Michael J. Sanger
Department of Chemistry, University of Northern Iowa, Cedar Falls, IA 50614-0423

Kimberly Geer
Grundy Center High School, Grundy Center, IA 50638

Cover
August 2002
Vol. 79 No. 8
p. 994
Abstract
In this experiment, students convert a copper oxide salt to copper metal by two chemical methods, one using methane gas in the solid state and one using aluminum metal in an aqueous solution. This method works for both copper(I) oxide and copper(II) oxide. Students determine the mass of copper metal produced from a given amount of copper oxide and plot this data for the entire class for each chemical method. The slope of these plots provides a measure of the mass fraction of the copper oxide salt that is copper, and the empirical formula of the salt is determined for each chemical method using the slope.
Supplement
Instructions for students, notes for the instructor, a schematic for the methane experiment, calculations for the empirical formulas, and student-generated data for the methane reactions (red and black oxide) are available.
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*  Citation
 Sanger, Michael J.; Geer, Kimberly. J. Chem. Educ. 2002 79 994.
*  Keywords
 General Chemistry; Introductory / High School Chemistry; Laboratory Instruction; Redox Reactions; Stoichiometry
*  History
 Created:
Last Updated:		 July 23, 2002
March 16, 2005
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