Summary: Glacial acetic acid is supercooled in ice then shaken to crystallize.
Glacial Acetic acid is corrosive.
Chemicals and Solutions:
New, unopened bottle of glacial acetic acid
Bucket of ice, large enough to submerge entire bottle of acetic acid
Several hours before the lecture, begin cooling the acetic acid in the bucket of ice. The ice must come up past the neck of the bottle. The acid should be left undisturbed in the ice for several hours. To perform the demonstration, simply open the bottle, reseal it and give it a vigorous shake. The acid should crystalize. (if it does not crystalize, open, reseal, and shake it again.)