Potassium Iodide

Potassium iodide is commonly known as gray iodine. Chemical formula KI. Molecular weight 166.00. Colorless or white cubic crystals. The taste is salty and bitter. Slightly deliquescent in moist air, easily oxidized when exposed to the air, releasing iodine and gradually turning yellow. Light and moisture can accelerate its decomposition. Specific gravity 3.13. Melting point: 681 ℃. Boiling point 1330 ℃. Easily soluble in water, soluble in ethanol, methanol, acetone, glycerol, and liquid ammonia, slightly soluble in ether. Its aqueous solution is neutral or slightly alkaline, and water-soluble Chemicalbook solution can dissolve iodine and generate triiodide ions (I3-). Its aqueous solution is also prone to oxidation and yellowing, making it easier when acidic. Adding alkali can prevent it. Obtained by the reaction of hydroiodic acid with potassium bicarbonate. Used as analytical reagents and raw materials for the production of iodides and dyes, as well as as as photographic emulsifiers and food additives. It is used in medicine to prevent and treat goiter (large neck disease), as well as for preoperative preparation of hyperthyroidism. In addition, it can also be used as expectorant and diuretic drugs.