The decomposition of nitrogen triiodide into nitrogen and iodine gas is a classic chemistry demonstration, recounted by many chemists as the demonstration that interested them in the science. The dark nitrogen triiodide solid is 'tickled' from a distance (usually using a feather on a long stick), causing it to burst into a cloud of violet vapor, accompanied by a very loud snap. It's a very simple and inexpensive demonstration to perform, just be sure to use proper safety precautions.
Perform the Demonstration | See a Video Clip
Perform the Demonstration | See a Video Clip
Comments
I can remember experimenting with NI3 years ago. I made it using a similar route to the classic Iodoform reaction. Disolve a quantity of potassium Iodide (KI) in aqueous ammonia NH4.OH and then precipitate out NI3 by adding common Laundry Bleach (Sodium Hypochlorite). Run the result under suction through a buchner funnel and filter paper and you are in business. Keep everything wet and do not make too much as a little of this stuff goes a long way…
Cheers,
Herb
Hi there- I tried “candy chromatography” in a recent unit and got zero results. Absolutely no separation of color in neither Skittles nor M&Ms. none. I tried 1% salt soln, i tried alcohol. This looks like a great classroom activity and I would LOVE for it to work – can you provide any tips? Thank you,
Patty