Potassium peroxide

Names
IUPAC name

Potassium peroxide

Identifiers

CAS Number

* 17014-71-0 Y

3D model (JSmol)

* Interactive image

ChemSpider |

* 26237 N

EC Number |

* 241-089-8

PubChem CID

* 28202

UNII |

* ZHB4ZOE9PU Y

InChI

* InChI=1S/2K.O2/c;;1-2/q2*+1;-2 N

Key: XXQBEVHPUKOQEO-UHFFFAOYSA-N 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

| Orthorhombic

Space group

| Cmca, oS16
Thermochemistry

Std molar
entropy (S ~~o~~ 298)

| 113 J·mol−1·K−1[2]

Std enthalpy of
formation (ΔfH⦵298)

| −496 kJ·mol−1[2]
Hazards
GHS pictograms |
GHS Signal word | Danger

GHS hazard statements

| H272, H315, H319

GHS precautionary statements

| P210, P220, P221, P264, P280, P302+352, P305+351+338, P321, P332+313, P337+313, P362, P370+378, P501
NFPA 704 (fire diamond)  |

~~W~~

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).

N verify (what is YN ?)
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:

2KA2OA2+2HA2O⟶4KOH+OA2↑

## 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. ↑ 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. ↑ 2.0 2.1 Zumdahl, Steven S. (2009). Chemical Principles 6th Ed.. Houghton Mifflin Company. p. A22. ISBN 978-0-618-94690-7.

* v
* t
* e

Potassium compounds

* KAsO2
* KBr
* KBrO3
* KCN
* KCNO
* KCl
* KClO
* KClO3
* KClO4
* KF
* KH
* KHCO2
* KHCO3
* KHF2
* KHS
* KHSO3
* KHSO4
* KH2AsO4
* KH2PO3
* KH2PO4
* KI
* KIO3
* KIO4
* KMnO4
* KNH2
* KN3
* K3N
* KNO2
* KNO3
* KOCN
* KOH
* KO2
* KPF6
* KSCN
* KCH3COO
* K2Al2O4
* K2CO3
* K2CrO4
* K2Cr2O7
* K2FeO4
* K2HPO4
* K2MnO4
* K2O
* K2O2
* K2PtCl4
* K2PtCl6
* K2S
* K2SeO4
* K2SO3
* K2SO4
* KHSO5
* K2S2O5
* K2S2O7
* K2S2O8
* K2Po
* K2SiO3
* K3[Fe(CN)6]
* K3[Fe(C2O4)3]
* K4[Fe(CN)6]
* K3PO4
* K4Mo2Cl8

* v
* t
* e

Oxygen compounds

* AgO
* Al2O3
* AmO2
* Am2O3
* As2O3
* As2O5
* Au2O3
* B2O3
* BaO
* BeO
* Bi2O3
* BiO2
* Bi2O5
* BrO2
* Br2O3
* Br2O5
* CO
* CO2
* C2O3
* CaO
* CaO2
* CdO
* CeO2
* Ce3O4
* Ce2O3
* ClO2
* Cl2O
* Cl2O3
* Cl2O4
* Cl2O6
* Cl2O7
* CoO
* Co2O3
* Co3O4
* CrO3
* Cr2O3
* Cr2O5
* Cr5O12
* CsO2
* Cs2O3
* CuO
* D2O
* Dy2O3
* Er2O3
* Eu2O3
* FeO
* Fe2O3
* Fe3O4
* Ga2O
* Ga2O3
* GeO
* GeO2
* H2O
* H218O
* H2O2
* HfO2
* HgO
* Hg2O
* Ho2O3
* I2O4
* I2O5
* I2O6
* I4O9
* In2O3
* IrO2
* KO2
* K2O2
* La2O3
* Li2O
* Li2O2
* Lu2O3
* MgO
* Mg2O3
* MnO
* MnO2
* Mn2O3
* Mn2O7
* MoO2
* MoO3
* Mo2O3
* NO
* NO2
* N2O
* N2O3
* N2O4
* N2O5
* NaO2
* Na2O
* Na2O2
* NbO
* NbO2
* Nd2O3
* OF2
* O2F2
* O3F2
* O4F2
* O2PtF6

Chemical formulas

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*[CID]: Compound ID
*[H272]: May intensify fire: oxidizer
*[H315]: Causes skin irritation
*[H319]: Causes serious eye irritation
*[P210]: Keep away from heat/sparks/open flames/hot surfaces – No smoking
*[P220]: Keep/Store away from clothing/…/combustible materials
*[P221]: Take any precaution to avoid mixing with combustibles
*[P264]: Wash … thoroughly after handling
*[P280]: Wear protective gloves/protective clothing/eye protection/face protection
*[P302+352]: IF ON SKIN: Wash with soap and water
*[P305+351+338]: IF IN EYES: Rinse continuously with water for several minutes. Remove contact lenses if present and easy to do – continue rinsing
*[P321]: Specific treatment (see … on this label)
*[P332+313]: If skin irritation occurs: Get medical advice/attention
*[P337+313]: Get medical advice/attention
*[P362]: Take off contaminated clothing and wash before reuse
*[P370+378]: In case of fire: Use … for extinction
*[P501]: Dispose of contents/container to …
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