Potassium peroxide
Chemical compound / From Wikipedia, the free encyclopedia
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).
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Potassium peroxide | |
Identifiers | |
3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.037.339 |
EC Number |
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PubChem CID |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
K2O2 | |
Molar mass | 110.196 g/mol |
Appearance | yellow amorphous solid |
Melting point | 490 °C (914 °F; 763 K) |
reacts with water[1] | |
Structure | |
Orthorhombic | |
Cmca, oS16 | |
Thermochemistry | |
Std molar entropy (S⦵298) |
113 J·mol−1·K−1[2] |
Std enthalpy of formation (ΔfH⦵298) |
−496 kJ·mol−1[2] |
Hazards | |
GHS labelling: | |
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) | |
Related compounds | |
Other anions |
Potassium chloride |
Other cations |
Lithium peroxide Sodium peroxide Rubidium peroxide Caesium peroxide |
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).
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Potassium peroxide reacts with water to form potassium hydroxide and oxygen: