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Potassium periodate: Wikis


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Potassium periodate
IUPAC name
Other names potassium metaperiodate
CAS number 7790-21-8 Yes check.svgY
PubChem 516896
Molecular formula IKO4
Molar mass 230 g mol−1
Appearance white powder
Density 3.618 g/cm3
Melting point

582 °C, 855 K, 1080 °F

Solubility in water 0.42 g/100 mL (20 °C)
4.4 g/100 mL (80 °C)
MSDS External MSDS
EU Index Not listed
Main hazards Oxidant
NFPA 704
NFPA 704.svg
Related compounds
Other anions Potassium iodide
Potassium iodate
Other cations Sodium periodate
Related compounds Periodic acid
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

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.



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