Potassium peroxide

Last updated
Potassium peroxide
K2O2-structure.jpg
Names
IUPAC name
Potassium peroxide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.037.339 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 241-089-8
PubChem CID
UNII
  • InChI=1S/2K.O2/c;;1-2/q2*+1;-2 X mark.svgN
    Key: XXQBEVHPUKOQEO-UHFFFAOYSA-N X mark.svgN
  • InChI=1/2K.O2/c;;1-2/q2*+1;-2
    Key: XXQBEVHPUKOQEO-UHFFFAOYAV
  • [O-][O-].[K+].[K+]
Properties
K2O2
Molar mass 110.196 g/mol
Appearanceyellow amorphous solid
Melting point 490 °C (914 °F; 763 K)
reacts with water [1]
Structure
Orthorhombic
Cmca, oS16
Thermochemistry
Std molar
entropy
(S298)
113 J·mol−1·K−1 [2]
−496 kJ·mol−1 [2]
Hazards
GHS labelling:
GHS-pictogram-rondflam.svg GHS-pictogram-exclam.svg
Danger
H272, H315, H319
P210, P220, P221, P264, P280, P302+P352, P305+P351+P338, P321, P332+P313, P337+P313, P362, P370+P378, P501
NFPA 704 (fire diamond)
NFPA 704.svgHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 0: Will not burn. E.g. waterInstability 2: Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water. E.g. white phosphorusSpecial hazard W+OX: Reacts with water in an unusual or dangerous manner AND is oxidizer
3
0
2
W
OX
Related compounds
Other anions
Potassium chloride
Other cations
Lithium peroxide
Sodium peroxide
Rubidium peroxide
Caesium peroxide
Related potassium oxides
Potassium oxide
Potassium superoxide
Potassium ozonide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
X mark.svgN  verify  (what is  Yes check.svgYX mark.svgN ?)

Potassium peroxide is an inorganic compound with the molecular formula K2O2. It is formed as potassium reacts with oxygen in the air, along with potassium oxide (K2O) and potassium superoxide (KO2).

Contents

Crystal structure Kristallstruktur Kaliumperoxid.png
Crystal structure

Potassium peroxide reacts with water to form potassium hydroxide and oxygen:

2 K2O2 + 2 H2O → 4 KOH + O2

Properties

Potassium peroxide is a highly reactive, oxidizing white to yellowish solid which, while not flammable itself, reacts violently with flammable materials. It decomposes violently on contact with water. [1]

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

Usage

Potassium peroxide is used as an oxidizing agent and bleach (due to the peroxide), and to purify air.

References

  1. 1 2 Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, Florida: CRC Press. pp. 477, 520. ISBN   0-8493-0594-2.
  2. 1 2 Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A22. ISBN   978-0-618-94690-7.