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  Home > JCE Print > Journal of Chemical Education > Issues > 2003  > June  >
In the Laboratory
Determination of Avogadro's Number by Improved Electroplating
Carlos A. Seiglie
Natural Science Department, University of Puerto Rico–Utuado, Utuado, PR 00641-2500
Cover
June 2003
Vol. 80 No. 6
p. 668
Abstract
A quick and accurate measurement of Avogadro‘s number from the amount of plated material can be made using a modification of an established electrolytic experiment. The experiment was modified to prevent loss of the copper plated at the cathode (copper plate) as a result of poor plating. The copper plating thus obtained was a firmly bonded and smooth layer, and the percent error of the results was reduced from approximately 20% to about 1% (the small error remaining is caused by the ammeter limits, not loss of plated mass). Control of the current during the experiment was also easier. If copper is not available it can be replaced by commonly available, inexpensive metals such as iron, zinc, or nickel.
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Instructions for the students, including pre- and post-lab questions, are available.
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*  Citation
 Seiglie, Carlos A. J. Chem. Educ. 2003 80 668.
*  Keywords
 Electrochemistry; General Chemistry; Laboratory Instruction; Metals; Quantitative Analysis
*  History
 Created:
Last Updated:		 May 5, 2003
February 28, 2005
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