Barium compounds: barium dibromide dihydrate

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The barium in barium dibromide dihydrate formally is in the oxidation state 2.

Barium dibromide dihydrate

  • Formula as often written: BaBr2.2H2O
  • Hill system formula: Ba1Br2H4O2
  • CAS registry number: [7791-28-8]
  • Formula weight: 333.166
  • Class: bromide

Synonyms

  • barium dibromide dihydrate
  • barium(II) bromide 2-water
  • barium bromide 2-water

Physical properties

  • Colour: white
  • Appearance: crystalline solid
  • Melting point: 75°C (decomposes, loses H2O)
  • Boiling point: 120
  • Density: 3700 kg m-3

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Element analysis

Element percentages for the elements in barium dibromide dihydrate
Element %
Ba 41.22
Br 47.97
H 1.21
O 9.60

Synthesis

Barium bromide is made by the neutralization of barium carbonate with HBr in water. The product crystallizes as the hydrate BaBr2.2H2O. If this heated, dehydration to anhydrous BaBr2 occurs.

BaCO3 + 2HBr(aq) → BaBr2(aq)

Isotope pattern

What follows is the calculated isotope pattern for the BaBr2.2H2O unit with the most intense ion set to 100%.

Formula: Ba1Br2H4O2

mass  %
324   0.1 
325 0.0
326 0.2
327 0.0
328 1.8 _
329 4.5 __
330 8.6 ____
331 16.3 ________
332 60.7 ______________________________
333 19.2 __________
334 100.0 __________________________________________________
335 7.4 ____
336 46.5 _______________________
337 0.1
338 0.2

References

The data on these compounds pages are assembled and adapted from the primary literature and several other sources including the following.

  • R.T. Sanderson in Chemical Periodicity, Reinhold, New York, USA, 1960.
  • N.N. Greenwood and A. Earnshaw in Chemistry of the Elements, 2nd edition, Butterworth, UK, 1997.
  • F.A. Cotton, G. Wilkinson, C.A. Murillo, and M. Bochmann, in Advanced Inorganic Chemistry, John Wiley & Sons, 1999.
  • A.F. Trotman-Dickenson, (ed.) in Comprehensive Inorganic Chemistry, Pergamon, Oxford, UK, 1973.
  • R.W.G. Wyckoff, in Crystal Structures, volume 1, Interscience, John Wiley & Sons, 1963.
  • A.R.West in Basic solid state chemistry Chemistry, John Wiley & Sons, 1999.
  • A.F. Wells in Structural inorganic chemistry, 4th edition, Oxford, UK, 1975.
  • J.D.H. Donnay, (ed.) in Crystal data determinative tables, ACA monograph number 5, American Crystallographic Association, USA, 1963.
  • D.R. Lide, (ed.) in Chemical Rubber Company handbook of chemistry and physics, CRC Press, Boca Raton, Florida, USA, 77th edition, 1996.
  • J.W. Mellor in A comprehensive treatise on inorganic and theoretical chemistry, volumes 1-16, Longmans, London, UK, 1922-1937.
  • J.E. Macintyre (ed.) in Dictionary of inorganic compounds, volumes 1-3, Chapman & Hall, London, UK, 1992.

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barium atomic number