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  Home > JCE Print > Journal of Chemical Education > Issues > 2006  > March  >
Chemical Education Today
Letters
The Reaction Quotent Is Unnecessary To Solve Equilibrium Problems. The Limitation of a Qualitative Reasoning—Editor's Note
John W. Moore
Department of Chemistry, University of Wisconsin–Madison, Madison, WI 53706
Cover
March 2006
Vol. 83 No. 3
p. 384
Full Text
The discussion of conductivity of aqueous solutions of acetic acid may have been influenced by subconscious recollections of an experiment different from the one described in Rob Lederer’s original letter. Like pure water, pure acetic acid is a relatively poor electrical conductor and will not cause a light-bulb conductivity apparatus to light. The University of Wisconsin–Madison lecture demonstrator, Jim Maynard, placed a conductivity tester in glacial acetic acid and several aqueous solutions of different concentrations, taking care to maintain the same electrode surface area throughout. The result, as shown by photographs in the Supplemental Material is that the bulb lights brightest when the concentration of acetic acid is about 5 mol/L. Both above and below that concentration the bulb is dimmer, and no glow can be seen for glacial acetic acid and for concentrations of 0.1 mol/L and below.
Supplement
Images showing the results of placing a conductivity sensor in glacial acetic acid and several aqueous solutions of different concentrations are available.
More Information
*  Citation
 Moore, John W. J. Chem. Educ. 2006 83 384.
*  Keywords
 Equilibrium; First-Year Undergraduate / General; High School / Introductory Chemistry; Mathematics / Symbolic Mathematics; Physical Chemistry; Textbooks / Reference Books
*  History
 Created:
Last Updated:		 1/31/2006
2/9/2006
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