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The sublimation of iodine is used to stain chromatography plates and in the detection of finger prints in forensic science. Safety This experiment can be performed in a well ventilated lab as long as the iodine is not overheated - the cold finger keeps the iodine vapour inside the conical flask.
If the flask is unsealed, the iodine vapour can escape. Eventually, the iodine sublimes away, just like an ice cube in a freezer. In another application of the diagram, imagine starting slightly to the right of point 2, and raising the pressure, on a line rising vertically. Initially, the iodine is liquid, but will change to solid at some point.
In this paper we offer a lecture demonstration showing the existence of all three states of iodine, supported by a short video-clip, hoping to give a contribution to the correction of misbelieves about the process of sublimation and the examples of subliming substances.
To show sublimation. Place 2 grams of Iodine in a 500 mL Erlenmeyer flask, and set a watch glass with ice over the mouth of the flask. Place the flask on a hot plate, and turn on the hot plate so the flask is heated slowly.
Iodine's vapor is a distinctive purple color and has a very strong scent, making it easy to detect. The video below shows the sublimation and deposition of iodine. The beaker containing iodine is covered with a round-bottom flask that contains ice.
In this paper we offer a lecture demonstration showing the existence of all three states of iodine, supported by a short video-clip, hoping to give a contribution to the correction of misbelieves...
When solid iodine is warmed, the solid sublimes and a vivid purple vapor forms (Figure \(\PageIndex{6}\)). The reverse of sublimation is called deposition , a process in which gaseous substances condense directly into the solid state, bypassing the liquid state.
The determination of the vapor pressure of solid iodine at temperatures from 25 to 65°C in steps of about 10°C is accomplished through spectrophotometric measurements of the absorbance A of the iodine vapor in equilibrium with the solid at the absorption maximum (520 nm).
When heated, solid iodine sublimates and enters the gas phase. Iodine got its name from the Greek word ‘ἰοειδής’, meaning ‘purple’. Indeed, iodine vapor has a beautiful purple color....
When a substance changes directly from its solid state to its gaseous state, this transition is known as sublimation in the chemical sciences. Crystalline iodine and solidified carbon dioxide are chemicals that sublimate at standard ambient temperatures and atmospheric pressure.