Potassium peroxide

{{Chembox

| Verifiedfields = changed

| Watchedfields = changed

| verifiedrevid = 443287436

| Name = Potassium peroxide

| ImageFile = K2O2-structure.jpg

| ImageSize =

| ImageName =

| IUPACName = Potassium peroxide

| OtherNames =

|Section1={{Chembox Identifiers

| CASNo_Ref = {{cascite|correct|??}}

| CASNo = 17014-71-0

| UNII_Ref = {{fdacite|correct|FDA}}

| UNII = ZHB4ZOE9PU

| RTECS =

| PubChem = 28202

| EINECS = 241-089-8

| SMILES = [O-][O-].[K+].[K+]

| ChemSpiderID_Ref = {{chemspidercite|changed|chemspider}}

| ChemSpiderID = 26237

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

| InChIKey = XXQBEVHPUKOQEO-UHFFFAOYAV

| StdInChI_Ref = {{stdinchicite|changed|chemspider}}

| StdInChI = 1S/2K.O2/c;;1-2/q2*+1;-2

| StdInChIKey_Ref = {{stdinchicite|changed|chemspider}}

| StdInChIKey = XXQBEVHPUKOQEO-UHFFFAOYSA-N

}}

|Section2={{Chembox Properties

| Formula = K₂O₂

| MolarMass = 110.196 g/mol

| Appearance = yellow amorphous solid

| Density =

| Solubility = reacts with water

{{cite book | last = Lide | first = David R. | year = 1998

| title = Handbook of Chemistry and Physics

| edition = 87 | location = Boca Raton, Florida | publisher = CRC Press

| isbn = 0-8493-0594-2 | pages = 477; 520}}

| MeltingPtC = 490

| BoilingPt =

}}

|Section3={{Chembox Structure

| CrystalStruct = Orthorhombic

| SpaceGroup = Cmca, oS16

| Coordination =

}}

|Section4={{Chembox Thermochemistry

| DeltaHf = −496 kJ·mol⁻¹{{cite book| author = Zumdahl, Steven S.|title =Chemical Principles 6th Ed.| publisher = Houghton Mifflin Company| year = 2009| isbn = 978-0-618-94690-7|page=A22}}

| Entropy = 113 J·mol⁻¹·K⁻¹

}}

|Section7={{Chembox Hazards

| GHSPictograms = {{GHS03}} {{GHS07}}

| GHSSignalWord = Danger

| HPhrases = {{H-phrases|272|315|319}}

| PPhrases = {{P-phrases|210| 220| 221| 264| 280| 302+352| 305+351+338| 321| 332+313| 337+313| 362| 370+378| 501}}

| GHS_ref =

| NFPA-H = 3

| NFPA-F = 0

| NFPA-R = 2

| NFPA-S = W+OX

| FlashPt =

}}

|Section8={{Chembox Related

| OtherAnions = Potassium chloride

| OtherCations = Lithium peroxide
Sodium peroxide
Rubidium peroxide
Caesium peroxide

| OtherFunction = Potassium oxide
Potassium superoxide
Potassium ozonide

| OtherFunction_label = potassium oxides

}}

}}

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).

File:Kristallstruktur Kaliumperoxid.png

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

:{{chem2 | 2 K2O2 + 2 H2O -> 4 KOH + O2 ↑}}