Barium bromide

Chembox new
ImageFile =
ImageSize = 200px
ImageName = Barium bromide
Section1 = Chembox Identifiers
CASNo = 10553-31-8
Section2 = Chembox Properties
Formula = BaBr₂ (anhydrous)
BaBr₂·2H₂O (dihydrate)
MolarMass = 297.14 g/mol
Appearance = White solid
Density = 4.78 g/cm³, anhydrous solid 3.58 g/cm³, dihydrate
Solubility = 92.2 g/100 ml (0°C)
MeltingPt = 857 °C
BoilingPt = 1835 °C
Section3 = Chembox Structure
Coordination =
CrystalStruct = orthorhombic
Section4 = Chembox Thermochemistry
DeltaHf = −181.1 kcal/mol
Section7 = Chembox Hazards
EUClass = Harmful (Xn)
RPhrases = R20, R22
SPhrases = S28 [https://fscimage.fishersci.com/msds/10358.htm]
Section8 = Chembox Related
OtherAnions = Barium fluoride
Barium chloride
Barium iodide
OtherCations = Calcium bromide
Strontium bromide
Lead bromide

Barium bromide is the chemical compound with the formula BaBr₂. Like barium chloride, it dissolves well in water and is toxic in aqueous solution.

tructure and properties

BaBr₂ crystallizes in a lead chloride motif, giving white orthorhombic crystals which are deliquescent. [Citation
last= Brackett
first= Elizabeth B.
author-link=
last2= Breackett
first2= Thomas E.
author2-link=
last3= Sass
first3=Ronald L.
author3-link=
year=
date=December
publication-date=1963
contribution=The Crystal Structures of Barium Chloride, Barium Bromide, and Barium Iodide.
contribution-url=
editor-last=
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editor2-last=
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title=The Journal of Physical Chemistry
edition=
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place=
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publisher=
volume=67
pages=2132
id=
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doi=
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url=http://pubs.acs.org/cgi-bin/abstract.cgi/jpchax/1963/67/i10/f-pdf/f_j100804a038.pdf?sessid=6006l3
issn=
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accessdate=2007-12-03] In aqueous solution BaBr₂ behaves as a simple salt.

Barium bromide reacts with the sulfate ion from sulfuric acid to produce a precipitate of barium sulfate.:BaBr₂(aq) + SO₄^2- → BaSO₄(s) + 2 Br^-(aq)Similar reactions occur with oxalic acid, hydrofluoric acid, and phosphoric acid.

Preparation

Barium bromide can be prepared from barium sulfide or barium carbonate via reaction with hydrobromic acid to give hydrated barium bromide.:BaS + HBr → BaBr₂ + H₂S:BaCO₃ + HBr → BaBr₂ + CO₂ + H₂OBarium bromide can be crystallized out from the solution in its dihydrate form, BaBr₂·2H₂O, which gives the anhydrous form upon heating to 120 °C. [Citation
last =Patnaik
first =Pradyot
author-link =
last2 =
first2 =
author2-link =
publication-date =
date =
year = 2003
title =Handbook of Inorganic Chemical Compounds
edition =
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publisher = McGraw-Hill Professional
pages = 81-82
id =
isbn =0070494398
doi =
oclc =
url= http://books.google.com/books?id=Xqj-TTzkvTEC&pg=RA1-PA81&dq=%22barium+bromide%22+subject:%22Chemistry,+Inorganic%22&ei=ondUR4ScB4yKpwLHj9HCBg&sig=IRCDxRhFJfMmES20I4dngv237Uo
accessdate = 2007-12-03]

Uses

Barium bromide is a precursor to chemicals used in photography and to other bromides. Historically, barium bromide was used to purify radium in a process of fractional crystallization devised by Marie Curie. Since radium precipitates preferentially in a solution of barium bromide, the ratio of radium to barium in the precipitate would be higher than the ratio in the solution. [Citation
last =Sime
first =Ruth Lewin
author-link =
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first2 =
author2-link =
publication-date =
date =
year = 1996
title =Lise Meitner: A Life in Physics
edition =
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publication-place =
place =
publisher = University of California Press
pages = 233
id =
isbn =0520208609
doi =
oclc =
url= http://books.google.com/books?id=uPzZQzx-mkcC&pg=PA233&dq=%22barium+bromide%22+radium&as_brr=3&ei=73pUR9rFJ474pwLC_IGLDw&sig=yB0nytEH5qWeIakFCgzNUJOUK1E
accessdate = 2007-12-03]

afety

Barium bromide, along with other water-soluble barium salts, is toxic and can cause severe poisoning if ingested.

References