Potassium periodate

Potassium periodate
IUPAC name Potassium periodate
Other names potassium metaperiodate
Identifiers
CAS number	7790-21-8 Y
PubChem	516896
ChemSpider	128877 Y
Jmol-3D images	{{#if:[K+].[O-]I(=O)(=O)=O|Image 1
SMILES [K+].[O-]I(=O)(=O)=O
InChI InChI=1S/HIO4.K/c2-1(3,4)5;/h(H,2,3,4,5);/q;+1/p-1 Y Key: FJVZDOGVDJCCCR-UHFFFAOYSA-M Y InChI=1/HIO4.K/c2-1(3,4)5;/h(H,2,3,4,5);/q;+1/p-1 Key: FJVZDOGVDJCCCR-REWHXWOFAS
Properties
Molecular formula	IKO4
Molar mass	230.00 g mol−1
Appearance	white powder
Density	3.618 g/cm3
Melting point	582 °C; 1,080 °F; 855 K
Solubility in water	0.42 g/100 mL (20 °C) 4.4 g/100 mL (80 °C)
Hazards
MSDS	External MSDS
EU Index	Not listed
Main hazards	Oxidant
NFPA 704	0 1 0 OX
Related compounds
Other anions	Potassium iodide Potassium iodate
Other cations	Sodium periodate
Related compounds	Periodic acid
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 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.