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  Home > JCE Print > Journal of Chemical Education > Issues > 2009  > April  >
In the Classroom
JCE DigiDemos: Tested Demonstrations
Small-Scale Production of High-Density Dry Ice: A Variant Combination of Two Classic Demonstrations
Paul A. Flowers
Department of Chemistry and Physics, University of North Carolina at Pembroke, Pembroke, NC 28372
Cover
April 2009
Vol. 86 No. 4
p. 470
Abstract
Easily recoverable, thumb-sized pieces of high-density dry ice are conveniently produced by deposition of carbon dioxide within a test tube submerged in liquid nitrogen. A carbon dioxide-filled balloon sealed over the mouth of the test tube serves as a gas reservoir, and further permits a dramatic demonstration of both the gas-to-solid phase transition and Avogadro's law, with complete deflation of a 2–3 L balloon requiring only about 2–3 minutes. The dry ice "cube" that forms within the test tube is readily removed after slightly warming the tube's outer surface and is of sufficient density to sink in an aqueous indicator solution, permitting its subsequent use for the classic demonstration of carbon dioxide's sublimation and its acidic properties.
Supplement
A video depicting the full course of this demonstration
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Contents
  JCE2009p0470W.zip
JCE2009p0470W.mov (QuickTime movie)
 
More Information
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Citation
Flowers, Paul A. J. Chem. Educ. 2009, 86, 470.
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Keywords
Acids / Bases; Demonstrations; Dyes / Pigments; First-Year Undergraduate / General; Gases; General Public; Hands-On Learning / Manipulatives; High School / Introductory Chemistry; Phases / Phase Transitions / Diagrams; Physical Chemistry
*
History
Created:
Last Updated:
2/20/2009
3/4/2009
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