Potassium peroxide

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Potassium peroxide
CAS number 17014-71-0 YesY
PubChem 28202
EC number 241-089-8
Jmol-3D images Image 1
Molecular 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]
Crystal structure Orthorombic
Space group Cmca, oS16
Std molar
113 J·mol−1·K−1[2]
Std enthalpy of
−496 kJ·mol−1[2]
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 3: Short exposure could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g., calcium Special hazard OX: Oxidizer. E.g., potassium perchlorateNFPA 704 four-colored diamond
Related compounds
Other anions Potassium oxide
Potassium superoxide
Potassium chloride
Other cations Lithium peroxide
Sodium peroxide
Except where noted otherwise, 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).

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

2 K2O2 + 2 H2O → 4 KOH + O2


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