Barium oxide

Barium oxide
Names
	Other names Neutral barium oxide (1:1); Barium protoxide; Calcined baryta; Baria;
Identifiers
CAS Number	1304-28-5 ;
3D model (JSmol)	Interactive image;
ChemSpider	56180 ;
ECHA InfoCard	100.013.753
EC Number	215-127-9;
PubChem CID	62392;
RTECS number	CQ9800000;
UNII	77603K202B ;
UN number	1884
CompTox Dashboard (EPA)	DTXSID20893234 ;
	InChI InChI=1S/Ba.O Key: QVQLCTNNEUAWMS-UHFFFAOYSA-N ; InChI=1/Ba.O/rBaO/c1-2 Key: QVQLCTNNEUAWMS-FXUTYLCTAB;
	SMILES [Ba]=O;
Properties
Chemical formula	BaO
Molar mass	153.326 g/mol
Appearance	white solid
Density	5.72 g/cm3, solid
Melting point	1,923 °C (3,493 °F; 2,196 K)
Boiling point	~ 2,000 °C (3,630 °F; 2,270 K)
Solubility in water	3.48 g/100 mL (20 °C); 90.8 g/100 mL (100 °C); Reacts to form Ba(OH)2;
Solubility	soluble in ethanol, dilute mineral acids and alkalies; insoluble in acetone and liquid ammonia
Magnetic susceptibility (χ)	-29.1·10−6 cm3/mol
Structure
Crystal structure	cubic, cF8
Space group	Fm3m, No. 225
Coordination geometry	Octahedral
Thermochemistry
Heat capacity (C)	47.7 J/K mol
Std molar; entropy (S⦵298)	70 J·mol−1·K−1
Std enthalpy of; formation (ΔfH⦵298)	−582 kJ·mol−1
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H302, H314, H315, H332, H412
Precautionary statements	P210, P220, P221, P260, P261, P264, P270, P271, P273, P280, P283, P301+P310, P301+P312, P301+P330+P331, P302+P352, P303+P361+P353, P304+P312, P304+P340, P305+P351+P338, P306+P360, P310, P312, P321, P330, P332+P313, P362, P363, P370+P378, P371+P380+P375, P405, P501
NFPA 704 (fire diamond)	3 0 0
Flash point	Non-flammable
Related compounds
Other anions	Barium hydroxide; Barium peroxide;
Other cations	Beryllium oxide; Magnesium oxide; Calcium oxide; Strontium oxide;
Supplementary data page
	Barium oxide (data page)
	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

Barium oxide, also known as baria, is a white hygroscopic non-flammable compound with the formula BaO. It has a cubic structure and is used in cathode ray tubes, crown glass, and catalysts. It is harmful to human skin and if swallowed in large quantity causes irritation. Excessive quantities of barium oxide may lead to death.

It is prepared by heating barium carbonate with coke, carbon black or tar or by thermal decomposition of barium nitrate.

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