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Potassium peroxide

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Title: Potassium peroxide  
Author: World Heritage Encyclopedia
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Subject: Potassium, Sodium peroxide, Potassium phosphate, Potassium octachlorodimolybdate, Potassium arsenite
Collection: Oxidizing Agents, Peroxides, Potassium Compounds
Publisher: World Heritage Encyclopedia

Potassium peroxide

Potassium peroxide
CAS number  YesY
EC number
Jmol-3D images Image 1
Molecular formula K2O2
Molar mass 110.196 g/mol
Appearance yellow amorphous solid
Melting point 490 °C
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
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)
 YesY   YesY/N?)

Potassium peroxide is an 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.  
  2. ^ a b Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A22.  
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