| Names | |
|---|---|
| IUPAC name
Potassium periodate
| |
| Other names
potassium metaperiodate
| |
| Identifiers | |
| ECHA InfoCard | 100.029.269 |
PubChem CID
|
|
CompTox Dashboard (EPA)
|
|
| Properties | |
| IKO4 | |
| Molar mass | 229.999 g·mol−1 |
| Appearance | white powder |
| Density | 3.618 g/cm3 |
| Melting point | 582 °C (1,080 °F; 855 K) |
| 0.42 g/100 mL (20 °C) 4.4 g/100 mL (80 °C) | |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards
|
Oxidant |
| NFPA 704 (fire diamond) | |
| Related compounds | |
Other anions
|
Potassium iodide Potassium iodate |
Other cations
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Sodium periodate |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
| |
Potassium periodate has formula KIO4.
It 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.
Note that the pronunciation is per-iodate, not period-ate.