Potassium periodate is an inorganic salt of potassium and the periodate ion. In common chemical usage, the name usually refers to potassium metaperiodate, with the formula KIO4. It is a white crystalline solid and a strong oxidizing agent.
Properties
The compound contains iodine in a high oxidation state, which gives it useful reactivity in water and in many laboratory reactions. Like other periodates, it is generally handled as an oxidizer rather than as an everyday salt. It should be distinguished from potassium iodate, KIO3, which has a lower oxygen content and different chemistry.
Preparation and use
Potassium periodate can be made by oxidation processes or by converting related iodine compounds into the periodate form. It is valued in analytical chemistry and organic synthesis, where it is used as a selective oxidant. One of its best-known laboratory roles is the cleavage of certain carbon-carbon bonds in compounds with neighboring hydroxyl groups, a reaction that helps identify or modify sugars and other polyols.
- Appearance: usually a white, crystalline solid
- Function: strong oxidizer in controlled laboratory settings
- Related compounds: potassium iodate and other periodates
Because it is reactive, potassium periodate is stored and used with care. Its importance lies less in everyday industrial use and more in specialized chemical analysis, research, and synthesis, where predictable oxidation behavior is needed.