Potassium oxide

Potassium oxide
Names
	IUPAC name potassium oxide
	Systematic IUPAC name potassium oxidopotassium
	Other names potash, dipotassium oxide
Identifiers
CAS Number	12136-45-7 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:88321;
ChemSpider	23354117 ;
ECHA InfoCard	100.032.012
EC Number	235-227-6;
MeSH	Potassium+oxide
PubChem CID	25520;
UNII	58D606078H ;
UN number	2033
CompTox Dashboard (EPA)	DTXSID3049754 ;
	InChI InChI=1S/2K.O Key: NOTVAPJNGZMVSD-UHFFFAOYSA-N ;
	SMILES O([K])[K];
Properties
Chemical formula	K2O
Molar mass	94.196 g·mol−1
Appearance	Pale yellow solid
Odor	Odorless
Density	2.32 g/cm3 (20 °C); 2.13 g/cm3 (24 °C)
Melting point	740 °C (1,360 °F; 1,010 K)
Solubility in water	Reacts forming KOH
Solubility	Soluble in diethyl ether
Structure
Crystal structure	Antifluorite cubic, cF12
Space group	Fm3m, No. 225
Lattice constant	a = 6.436 Å α = 90°, β = 90°, γ = 90°
Coordination geometry	Tetrahedral (K+); Cubic (O2−)
Thermochemistry
Heat capacity (C)	83.62 J/mol·K
Std molar; entropy (S⦵298)	94.03 J/mol·K
Std enthalpy of; formation (ΔfH⦵298)	−363.17 kJ/mol
Gibbs free energy (ΔfG⦵)	−322.1 kJ/mol
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Corrosive, reacts violently with water
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H314
Precautionary statements	P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P405, P501
NFPA 704 (fire diamond)	3 0 1 W
Safety data sheet (SDS)	ICSC 0769
Related compounds
Other anions	Potassium sulfide; Potassium selenide; Potassium telluride; Potassium polonide
Other cations	Lithium oxide; Sodium oxide; Rubidium oxide; Caesium oxide
Related potassium oxides	Potassium peroxide; Potassium superoxide; Potassium ozonide
Related compounds	Potassium hydroxide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Potassium oxide (K₂ O) is an ionic compound of potassium and oxygen. It is a base. This pale yellow solid is the simplest oxide of potassium. It is a highly reactive compound that is rarely encountered. Some industrial materials, such as fertilizers and cements, are assayed assuming the percent composition that would be equivalent to K₂O.

^ ^a ^b ^c ^d Anatolievich, Kiper Ruslan. "potassium oxide". chemister.ru. Retrieved 2014-07-04.
^ ^a ^b ^c Lide, David R., ed. (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida: CRC Press. ISBN 978-1-4200-9084-0.
^ ^a ^b ^c Wyckoff, Ralph W.G. (1935). The Structure of Crystals (2nd ed.). Reinhold Publishing Corp. p. 25. {{cite book}}: |work= ignored (help)
^ ^a ^b ^c Dipotassium oxide in Linstrom, Peter J.; Mallard, William G. (eds.); NIST Chemistry WebBook, NIST Standard Reference Database Number 69, National Institute of Standards and Technology, Gaithersburg (MD) (retrieved 2014-07-04)

[chemister-1] Anatolievich, Kiper Ruslan. "potassium oxide". chemister.ru. Retrieved 2014-07-04.

[crc-2] Lide, David R., ed. (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida: CRC Press. ISBN 978-1-4200-9084-0.

[socacs-3] Wyckoff, Ralph W.G. (1935). The Structure of Crystals (2nd ed.). Reinhold Publishing Corp. p. 25. {{cite book}}: |work= ignored (help)

[nist-4] Dipotassium oxide in Linstrom, Peter J.; Mallard, William G. (eds.); NIST Chemistry WebBook, NIST Standard Reference Database Number 69, National Institute of Standards and Technology, Gaithersburg (MD) (retrieved 2014-07-04)

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