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Published on Oct 27, 2014
SAFETY: - Work in a fumehood or outside, isolated from the ground. - Ammonium dichromate is a verified carcinogen. Avoid contact. - Concentrated ammonia is corrosive and gives off an awful, pungent smell. Avoid contact and don't breathe in the fumes. - This reaction produces several chromium(VI) compounds. These are very bad for the environment and all are carcinogenic. Be very careful when cleaning up your fumehood.
HOW TO: - Pour a small layer of concentrated ammonia(25%) in a large container(e.g. an erlenmeyer). - Close it off with a watch glass and swirl the liquid around a few times. - Take a spatula of ammonium dichromate and heat it up for a few seconds with a burner. - Quickly take the watch glass off the erlenmeyer and swirl the 'burning' dichromate around in the erlenmeyer. Close the erlenmeyer afterwards. - Observe the 'fireflies' in your erlenmeyer.