JCE Online Journal of Chemical Education
 | Subscriptions  | Software Orders  | Support  | Contributors  | Advertisers  | 



  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.
Supplement
Instructions for the students, including pre- and post-lab questions, are available.
*  Contents JCE2003p0668W.doc (Microsoft Word)
*  Download
JCE2003p0668W.pdf

JCE2003p0668W.zip

JCE2003p0668W.sit
More Information
*  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
<< Previous Article Table of Contents Next Article >>
  Home > JCE Print > Journal of Chemical Education > Issues > 2003  > June  > Page 668



Chemistry Teacher Connection

The "Chemistry Teacher Connection" (CTC) is especially for high school chemistry teachers. For only $40/year, it offers an online-only subscription to CLIC along with membership in the Division of Chemical Education, normally $65/year. CTC subscribers receive access to all articles and supplements from 1996 through the current issue.
More About CTC
Order the Chemistry Teacher Connection

C&EN CLICs

Through special arrangement with the ACS, JCE High School CLIC is now able to provide subscribers with online access to Chemical & Engineering News articles that have been selected specifically for secondary science instructors and their students. 
 C&EN CLICs

JCE Collections Available
Occasionally, collections of JCE back issues become available for donation to individual teachers, schools, or libraries. JCE matches collections with interested recipients. Recipients pay shipping costs or pick up the collection.
 List of available collections

Contributions Welcome
JCE welcomes your submission
 Contributors's Corner

Subscriptions
 Subscription Info
 Order Forms

Fishing for New Ideas
Always in the
process of
improving, CLIC
welcomes ideas and comments.

Email Us

NSF logoDivCHEDACS ACS PubsFor journals in other fields of chemistry visit ACS Publications.
Comments to
jceonline@chem.wisc.edu		 Copyright © 2008 Division of Chemical Education, Inc., American Chemical Society.
All rights reserved.		  Terms | Privacy