Potassium peroxide

Crystal structure
__ K +      __ O -
General
Surname	Potassium peroxide
other names	Dipotassium peroxide Dipotassium dioxide
Ratio formula	K 2 O 2
Brief description	white to yellowish, amorphous powder
External identifiers / databases
CAS number 17014-71-0 EC number 241-089-8 ECHA InfoCard 100.037.339 PubChem 28202 ChemSpider 26237 Wikidata Q379359
properties
Molar mass	110.20 g mol −1
Physical state	firmly
density	2.14 g cm −3
Melting point	490 ° C (decomposition)
solubility	violent decomposition in water
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 271-314-332 P: ?
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Potassium peroxide is a chemical compound from the group of peroxides .

Extraction and presentation

Potassium peroxide can be formed by the reaction of potassium with oxygen (e.g. combustion), with potassium oxide and potassium hyperoxide also being formed.

${\displaystyle \mathrm {2\ K+\ O_{2}\longrightarrow \ K_{2}O_{2}} }$

Potassium peroxide is also formed when potassium oxide comes into contact with air.

properties

Potassium peroxide is a very reactive, oxidizing white to yellowish solid that is not itself flammable, but reacts violently with flammable substances. It decomposes violently on contact with water.

The standard enthalpy of formation of potassium peroxide is ΔH _f ⁰  = −496 kJ / mol.

use

Potassium peroxide is used as an oxidizer and bleach, as well as to purify the air.

See also

• Potassium oxide
• Potassium hyperoxide

Individual evidence

1. ↑ ^{a b c d e f} Entry for CAS no. 17014-71-0 in the GESTIS substance database of the IFA , accessed on January 3, 2020 (JavaScript required)
2. ↑ Potassium on rope night
3. ^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 1176.