Potassium periodate

Names
IUPAC name Potassium periodate
Other names potassium metaperiodate
Identifiers
CAS Number	7790-21-8 Y
3D model (JSmol)	Interactive image
ChemSpider	128877 Y
ECHA InfoCard	100.029.269
EC Number	232-196-0
PubChem CID	516896
CompTox Dashboard (EPA)	DTXSID90894076
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
SMILES [K+].[O-]I(=O)(=O)=O
Properties
Chemical formula	IKO4
Molar mass	229.999 g·mol−1
Appearance	white powder
Odor	odorless
Density	3.618 g/cm3
Melting point	582 °C (1,080 °F; 855 K)
Solubility in water	0.17 g/100 mL (0 °C) 0.42 g/100 mL (20 °C) 4.44 g/100 mL (80 °C) 7.87 g/100 mL (100 °C)
Structure
Crystal structure	tetragonal
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	Oxidant
NFPA 704 (fire diamond)	1 0 0 OX
Related compounds
Other anions	Potassium iodide Potassium iodate
Other cations	Sodium periodate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

Potassium periodate has formula KIO₄.

Note that the pronunciation is per-iodate, not period-ate.

Preparation

Potassium periodate is created by the slow oxidation of iodine or hydrogen iodide.

Alternatively, it can be created by the electrolysis of potassium iodate in an acidic environment.

Chemical Properties

Potassium periodate decomposes at 582 °C to form potassium iodate and oxygen.

The low solubility of KIO₄ makes it useful for the determination of potassium and cerium.

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.