Animated video: 37 principles of chemical reactions and their dangers – the aluminum-iodine reaction
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Principle: Mixing elemental iodine with powdered aluminum metal, along with a small amount of water, can trigger a vigorous reaction. Main reaction equation: 2Al(s) + 3I2(s) → Al2I6(s), with water acting as a catalyst. As the reaction proceeds, elemental iodine also sublimes to form purple iodine vapor. Trivia: When it comes to aluminum powder, the most striking phenomenon is probably the thermite reaction; let’s take a look at that again: Hazard: Medium to high. The reaction is vigorous; iodine vapor is irritating, so it is necessary to protect the eyes and conduct the operation in a fume hood. After adding water, the reaction may take a moment to start; do not rush to get close and check at this time. Recorder: Scott Milam
Medium to high. The reaction is intense; iodine vapor is irritating, so care should be taken to protect the eyes