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RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY
Preparing nitrogen triiodide. Footage of crystals of iodine being ground up using a pestle and mortar as part of the preparation of the contact explosive nitrogen triiodide. The iodine powder will be added to concentrated ammonia and the reaction mixture then passed through filter paper to obtain the brown precipitate nitrogen triiodide (NI3). The instability of NI3, an example of a very sensitive contact explosive, is due to the steric strain of three relatively large iodine atoms bound to the relatively small nitrogen atom.
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