Editing Barium oxide (section)

{{Short description|Chemical compound used in cathode-ray tubes}}
{{redirect|BaO||BAO (disambiguation)|and|Bao (disambiguation)}}
{{Chembox
| Verifiedfields = changed
| Watchedfields  = changed
| verifiedrevid  = 443645196
| Name           = Barium oxide
| ImageFile      = Barium-oxide-3D-vdW.png
| ImageFile1     = Barium oxide.JPG
| OtherNames     = {{unbulleted list
| Neutral barium oxide (1:1)
| Barium protoxide
| Calcined baryta
| Baria }}
| IUPACName = 
| SystematicName = 
| Section1 = {{Chembox Identifiers
 | ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
 | ChemSpiderID = 56180
 | InChI        = 1/Ba.O/rBaO/c1-2
 | SMILES       = [Ba]=O
 | InChIKey     = QVQLCTNNEUAWMS-FXUTYLCTAB
 | StdInChI_Ref    = {{stdinchicite|correct|chemspider}}
 | StdInChI        = 1S/Ba.O
 | StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
 | StdInChIKey     = QVQLCTNNEUAWMS-UHFFFAOYSA-N
 | CASNo     = 1304-28-5
 | CASNo_Ref = {{cascite|correct|CAS}}
 | UNII_Ref  = {{fdacite|correct|FDA}}
 | UNII    = 77603K202B
 | RTECS   = CQ9800000
 | PubChem = 62392
 | EC_number = 215-127-9
 | UNNumber  = 1884
}}
| Section2 = {{Chembox Properties
 | Formula = 
 | Ba=1 | O   = 1
 | MolarMass  = 153.326 g/mol
 | Appearance = white solid
 | Density    = 5.72 g/cm<sup>3</sup>, solid
 | Solubility = {{unbulleted list
 | 3.48 g/100 mL (20 °C)
 | 90.8 g/100 mL (100 °C)
 | Reacts to form [[Barium hydroxide|Ba(OH)<sub>2</sub>]] }}
 | SolubleOther = soluble in [[ethanol]], dilute mineral acids and alkalies; insoluble in [[acetone]] and liquid [[ammonia]]
 | MeltingPtC   = 1923
 | MeltingPt_notes = 
 | BoilingPt  = ~
 | BoilingPtC = 2000
 | MagSus     = −29.1·10<sup>−6</sup> cm<sup>3</sup>/mol
}}
| Section3 = {{Chembox Structure
 | Coordination  = [[octahedron|Octahedral]]
 | CrystalStruct = [[Cubic crystal system|cubic]], [[Pearson symbol|cF8]]
 | SpaceGroup    = Fm<u style="text-decoration:overline">3</u>m, No. 225
}}
| Section4 = {{Chembox Thermochemistry
 | DeltaHf      = −582&nbsp;kJ·mol<sup>−1</sup><ref name="Zumdahl">{{cite book| author = Zumdahl, Steven S.|title =Chemical Principles 6th Ed.| publisher = Houghton Mifflin Company| year = 2009| isbn = 978-0-618-94690-7}}</ref>
 | Entropy      = 70&nbsp;J·mol<sup>−1</sup>·K<sup>−1</sup><ref name="Zumdahl"/>
 | HeatCapacity = 47.7 J/K mol
}}
| Section5 = 
| Section6 = 
| Section7 = {{Chembox Hazards
 | GHSPictograms = {{GHS05}}{{GHS06}}{{GHS07}}
 | GHSSignalWord = Danger
 | HPhrases = {{H-phrases|301|302|314|315|332|412}}
 | PPhrases = {{P-phrases|210|220|221|260|261|264|270|271|273|280|283|301+310|301+312|301+330+331|302+352|303+361+353|304+312|304+340|305+351+338|306+360|310|312|321|330|332+313|362|363|370+378|371+380+375|405|501}}
 | NFPA-H   = 3
 | NFPA-F   = 0
 | NFPA-R   = 0
 | FlashPt  = Non-flammable
}}
| Section8 = {{Chembox Related
 | OtherAnions = {{unbulleted list
 | [[Barium hydroxide]]
 | [[Barium peroxide]] }}
 | OtherCations = {{unbulleted list
 | [[Beryllium oxide]]
 | [[Magnesium oxide]]
 | [[Calcium oxide]]
 | [[Strontium oxide]] }}
}}
}}

'''Barium oxide''', also known as '''baria''', is a white [[hygroscopic]] non-flammable [[chemical compound|compound]] with the formula BaO. It has a [[Cubic crystal system|cubic]] structure and is used in [[cathode-ray tube]]s, crown glass, and [[Catalysis|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 (fuel)|coke]], [[carbon black]] or [[tar]] or by [[thermal decomposition]] of [[barium nitrate]].{{Citation needed|date=September 2014}}