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Demonstration Extension: Copper-to-Silver-to-Gold Penny Demonstration

Ed Vitz

Department of Physical Sciences, Kutztown University, Kutztown, PA 19530

J. Chem. Educ., 2008, 85 (10), p 1381

DOI: 10.1021/ed085p1381.1

Publication Date (Web): October 1, 2008

Abstract

This demonstration, if done in the original way, can lead to fires in waste containers (sometimes in the middle of the night after the experiment has been conducted), because pyrophoric zinc is generated by suspending powdered zinc in hot sodium hydroxide. This is avoided by using hot ZnSO₄.

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History

Received: August 03, 2009

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New Observations on the Copper-to-Silver-to-Gold DemonstrationJournal of Chemical Education
- New Observations on the Copper-to-Silver-to-Gold Demonstration
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  Journal of Chemical Education 2008 85 (10), p 1381
  Abstract:
  The demonstration in which a copper penny is converted first to "silver" and then to "gold" involves, as the first step, the deposition of zinc onto copper in hot NaOH solution. The reaction involves an electrochemical cell, with the deposition of zinc in ...
  Abstract | PDF w/ Links | Hi-Res PDF

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