Barium oxide

Barium oxide

Chembox new
Name = Barium oxide
OtherNames = Barium monoxide; barium protoxide; calcined baryta
Section1 = Chembox Identifiers
CASNo = 1304-28-5
Section2 = Chembox Properties
Formula = BaO
MolarMass = 153.3 g/mol
Appearance = white solid
Density = 5.7 g/cm³, solid
Solubility = 3.8 g/100 ml (20 °C)
MeltingPt = 1923 °C
BoilingPt = ~2000 °C
Section3 = Chembox Structure
Coordination = Octahedral
CrystalStruct = cubic
Section7 = Chembox Hazards
EUClass = Harmful (Xn)
RPhrases = R20/22
SPhrases = S2, S28
FlashPt = non-flammable
Section8 = Chembox Related
OtherAnions = Barium hydroxide
Barium peroxide
OtherCations = Calcium oxide
Strontium oxide

Barium oxide, BaO, is a white hygroscopic compound formed by the burning of barium in oxygen, although it is often formed through the decomposition of other barium salts. [ cite web | title = Compounds of barium:barium (II) oxide | work = Web Elements | publisher = The University of Sheffield | date = 2007-01-26 | url = http://www.webelements.com/webelements/compounds/text/Ba/Ba1O1-1304285.html | accessdate = 2007-02-22 ]

: 2Ba + O2 → 2BaO: BaCO3 → BaO + CO2

It transforms into barium hydroxide on contact with water.

: BaO + H2O → Ba(OH)2

Uses

Barium oxide is used as a coating for hot cathodes, and in cathode ray tubes. It is used in the production of certain kinds of glass such as optical crown glass. It replaced lead oxide. Lead oxide was used to raise the refractive index, but it also raised the dispersive power. Barium oxide only raises the refractive index. [ cite web | title = Barium Oxide (chemical compound) | work = Encyclopædia Britanica | publisher = Encyclopædia Britanica | date = 2007 | url = http://www.britannica.com/eb/topic-53368/barium-oxide | accessdate = 2007-02-19 ] Barium oxide also has use as an ethoxylation catalyst in the reaction of ethylene oxide and alcohols, which takes place between 150 and 200°C. [Citation | last = Nield | first = Gerald | last2 = Washecheck | first2 = Paul | last3 = Yang | first3 = Kang | title = United States Patent 4210764 | date = 05-04 | year = 1979 | url = http://www.freepatentsonline.com/4210764.html | access-date = 2007-02-20 ]

afety issues

Barium oxide is an irritant. If it contacts the skin or the eyes or is inhaled it causes pain and redness. However, it is more dangerous when ingested. It can cause nausea and diarrhea, muscle paralysis, cardiac arrhythmia, and can cause death. If ingested, medical attention should be sought immediately.Barium oxide also is dangerous to the environment. It is harmful especially to aquatic organisms [ cite web | title = Barium Oxide (ICSC) | publisher = IPCS | date = October 1999 | url = http://www.inchem.org/documents/icsc/icsc/eics0778.htm | accessdate = 2007-02-19 ]

References

External links

* [http://www.ilo.org/public/english/protection/safework/cis/products/icsc/dtasht/_icsc07/icsc0778.htm International Chemical Safety Card 0778]


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