Potassium Iodide (CAS 7681-11-0) is an inorganic salt that pairs potassium with iodine, supplied as a crystalline solid that is odorless, water-soluble, hygroscopic and light-sensitive; it is used as an expectorant, a radiation-blocking agent, a thyroid medication and in animal feed fortification. It is hygroscopic and releases iodine upon exposure to light or oxidants.
Typical Properties
| Molecular formula | IK |
|---|---|
| Molecular weight | 166 g/mol |
| Form | particles (round) |
| Color | Yellow |
| Odor | odorless |
| Melting point | 680 °C |
| Boiling point | 1330 °C |
| Density | 3.13 g/cm³ |
| Water solubility | 1.43 kg/L |
| Flash point | 1330°C |
| pH | 6.0-9.0 (25°C, 1M in H2O) |
| GHS signal word | Danger · Irritant / harmful, Health hazard, Environmental hazard |
| HS code | 28276000 |
| Grades available | Pharma Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Potassium Iodide
Applications
Used in pharmaceuticals as an expectorant, radiation-blocking agent, and thyroid medication. In photography and analytical chemistry, it’s used for iodometric titrations. Also applied in animal feed fortification and electroplating baths.
Safety & Risks
Non-toxic in regulated use; excessive intake may disturb thyroid function. Protect from light and air exposure.
Packaging
Delivered in 25 kg aluminum-lined fiber drums or double-layer foil bags. Store in cool, dry, and sealed environments away from oxidizers.