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Potassium Iodide is known as Potassium Salt of Hydriodic Acid [HI], available in white crystalline powder form. It is an inorganic compound and has Molecular Formula KI. Its Ionic form is K+ I-, and iodide ion being mild reducing agent, it can be easily oxidized to Iodine by powerful oxidizing agent like chlorine. With elemental iodine it forms I3 (tri iodide), the salts of tri iodide are highly water soluble. On long exposure to air Potassium Iodide becomes yellow due to liberation of Iodine.

It is used as a key raw material in the synthesis of Iodo alkanes such as Methyl iodide and also in the preparation of Silver Iodide which is used in Photography for high speed photographic films.
Other applications include : Preparation of Potassium Iodate which is obtained by the oxidation of Potassium Iodide with Potassium chlorate or Potassium bromate. It is useful in the treatment of radiation poisoning resulting from nuclear accidents and also as a nutritional supplement for iodine in poultry feeds