"Chemical Teleport" experiment
Sublimation of iodine
Sublimation is the transition from a solid to a gas phase, without passing through a liquid phase. This experiment is impressive because from unremarkable black granules of iodine, a beautiful violet cloud is formed, which gradually disappears on cooling.
Reagents and equipment:
- crystal iodine;
- heat-resistant beaker;
- round-bottomed flask;
- hot plate.
Place a few grams of crystal iodine in the beaker and cover it with the flask containing ice. Place the beaker on the hot plate or other heating device. Turn on the heat. Observe iodine vapor appear, which settles on the flask.
On heating, iodine does not melt, but immediately moves to a gas phase, i.e. it sublimes. The iodine vapor formed rises,settling on the cold flask and forming crystal iodine. This process is called desublimation. This property of iodine is used for removing various impurities from it.
Wear protective gloves and conduct the experiment in a well-ventilated room. Observe safety rules when working with electrical devices.
Warning! Substances of this experiment are toxic and highly dangerous for your health. Do not try this at home. Only under professional supervision.