Concentrated sulfuric acid is extremely dangerous. Choking sulfuric acid vapor will rise from the container. Do this demonstration in a fume hood. The reaction takes a little while to get started, so don't be tempted to dump more acid on the sugar if nothing seems to be happening. If you have a hood, use it.
For the procedure, refer to Bassam Shakhashiri's Chemical Demonstrations: A Handbook for Teachers of Chemistry, Volume 1, pp 77-78 (1983).
Author: Fred Senese firstname.lastname@example.org
Copyright © 1997-2010 by Fred Senese
Comments & questions to email@example.com
Last Revised 02/15/10.URL: http://antoine.frostburg.edu/chem/senese/101/thermo/faq/print-carbon-tower.shtml