Barium bromide - BaBr<sub>2</sub>

What is Barium bromide?

BaBr2 is an important chemical compound with chemical name Barium bromide. It is also called Barium (2+) dibromide or Barium bromide anhydrous. It appears as a white solid which is soluble in water and is toxic in aqueous form.

Barium (2+) dibromide, crystallizes to lead chloride motifs resulting in white, deliquescent, orthorhombic crystals. In its aqueous form it acts like a simple salt. It reacts with the sulfate ion of sulfuric acid (H2SO4) to give barium sulfate (BaSO4) precipitates.

BaBr2(aq) + SO42− → BaSO4(s) + 2 Br(aq)

Properties of Barium bromide – BaBr2

BaBr2

Barium bromide

Molecular weight of BaBr2

297.14 g/mol

Density of Barium bromide

4.78 g/cm3 (anhydrous)

Boiling point of Barium bromide

1,835 °C

Melting Point of Barium bromide

857 °C

Barium bromide structure – BaBr2

Structure of Barium bromide

The exact mass of barium bromide is 297.74 g/mol and the monoisotopic mass is 297.742 g/mol. The number of hydrogen bond donors equals to zero whereas the number of hydrogen bond acceptors equals to 2. The compound is canonicalized and has three covalently bonded units.

BaBr2 Uses (Barium bromide)

  • Barium bromide is used as a precursor in chemicals.
  • Used in photography.
  • It was used in a process called fractional crystallization to purify radium.
  • Used in the manufacturing of other bromides.
  • Used in the production of phosphors.

Production of Barium bromide

BaBr2 can be prepared from barium carbonate or barium sulfide by reacting with hydrobromic acid (HBr) to produce hydrated barium bromide. The reaction is as follows:

BaS + 2HBr → BaBr2 + H2S

BaCO3 + 2HBr → BaBr2 + CO2 + H2O

Barium (2+) dibromide can be crystallized out from the solution in its dihydrate form. On heating at around 120 °C, BaBr2·2H2O gives the anhydrous form.

Health hazards

Barium bromide anhydrous along with a few other water-soluble barium salts, is considered toxic and when swallowed causes severe poisoning.

Learn more about the Structure, physical and chemical properties of BaBr2 from the experts at BYJU’S.

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