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Table of Contents
September 2009
Volume 86, Issue 9
Pages 1003-1104
About the Cover:
Acrylic Tanks for Stunning Chemical Demonstrations. To make chemical demonstrations of aqueous solution experiments visible to a large audience, acrylic tanks can be used, as described in the article by Mirholm and Ellervik. In the image on the cover, one such tank is used to visualize changes in pH upon addition of dry ice to a tank filled with Yamada’s universal indicator (i.e., a mix of thymol blue, methyl red, bromothymol blue, and phenolphthalein). The dry ice is added in the middle of the tank and the evolution of carbon dioxide produces currents in the solution and a pH gradient forms, generating the different colors of the indicator.
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