Potassium Iodide

Description

Potassium iodide
Potassium iodide is a white crystalline salt with chemical formula KI
Areas of use
Potassium iodide is used in photography and radiation treatment. It finds widespread application as an iodide source because it is less hygroscopic than sodium iodide, making it easier to work with. Potassium iodide can turn yellow upon heating in air or upon standing in moist air for long periods, because of oxidation of the iodide to iodine.
Potassium iodide is used in photography, in the preparation of silver(I) iodide for high speed photographic film. Potassium iodide is also added to table salt in small quantities to make it "iodized". In a saturated solution, it is also used as an expectorant to treat lung congestion.
Potassium iodide is often used as a source of iodide ion in organic synthesis. A useful application is in the preparation of aryl iodides from arenediazonium salts
Potassium iodide may also be used to protect the thyroid from radioactive iodine in the event of an accident or terrorist attack at a nuclear power plant, or other nuclear attack

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