Potassium periodate, meta, 99.5%

Potassium periodate is slightly soluble in water (one of the less soluble of potassium salts, owing to a large anion), giving rise to a solution that is slightly alkaline. On heating (especially with manganese(IV) oxide as catalyst), it decomposes to form potassium iodate, releasing oxygen gas. The low solubility of KIO4 makes it useful for the determination of potassium.