Potassium peroxide

Potassium peroxide
Names
	IUPAC name Potassium peroxide
Identifiers
CAS Number	17014-71-0 ;
3D model (JSmol)	Interactive image;
ChemSpider	26237 ;
ECHA InfoCard	100.037.339
EC Number	241-089-8;
PubChem CID	28202;
UNII	ZHB4ZOE9PU ;
CompTox Dashboard (EPA)	DTXSID2066143 ;
	InChI InChI=1S/2K.O2/c;;1-2/q2+1;-2 Key: XXQBEVHPUKOQEO-UHFFFAOYSA-N ; InChI=1/2K.O2/c;;1-2/q2+1;-2 Key: XXQBEVHPUKOQEO-UHFFFAOYAV;
	SMILES [O-][O-].[K+].[K+];
Properties
Chemical formula	K2O2
Molar mass	110.196 g/mol
Appearance	yellow amorphous solid
Melting point	490 °C (914 °F; 763 K)
Solubility in water	reacts with water[1]
Structure
Crystal structure	Orthorombic
Space group	Cmca, oS16
Thermochemistry
Std molar; entropy (So298)	113 J·mol−1·K−1[2]
Std enthalpy of; formation (ΔfH⦵298)	−496 kJ·mol−1[2]
Hazards
NFPA 704 (fire diamond)	0 3 2 W; OX
Related compounds
Other anions	Potassium oxide; Potassium superoxide; Potassium chloride
Other cations	Lithium peroxide; Sodium peroxide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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	Infobox references

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).

Crystal structure

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

{\ce {2K2O2 + 2H2O -> 4KOH + O2 (^)}}

References

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

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