Barium Iodide - BaI<sub>2</sub>

What is Barium Iodide?

Barium iodide (Bal2) obtained by the decomposition of the barium by means of metallic sodium. Barium iodide crystallizes in small, colorless needles, which deliquesce slightly, and are very soluble in water. Barium (Gk barys, heavy) is a heavy metal, first isolated by Sir Humphry Davy in England by electrolysis of molten barium salts in 1808. It is prepared by the action of hydroiodic acid on barium hydroxide or barium carbonate solution.

IUPAC name – barium(2+) diiodide

BaI2

Barium iodide

Density

5.15 g/cm³

Molecular Weight/ Molar Mass

391.136 g/mol

Boiling Point

2,027 °C

Melting Point

711 °C

Chemical Formula

BaI2

Barium Iodide Structure – BaI2

Barium Iodide

Physical Properties of Barium Iodide – BaI2

Odour

Odourless

Appearance

White solid

Covalently-Bonded Unit

3

Complexity

2.8

pH

7

Solubility

Readily soluble in alcohol

Chemical Properties of Barium Iodide – BaI2

  • Barium iodide reacts with potassium bromide forming yellow precipitate of potassium iodide and barium bromide.
  • KBr + BaI2 → KI + BaBr2

  • Barium sulfate is formed when barium iodide is treated with sodium sulfate. The chemical equation is given below.
  • BaI2 + Na2SO4 → BaSO4 + NaI

Uses of Barium Iodide – BaI2

  • Used in the preparation of barium dioxide, but has no medicinal use
  • Used in the manufacture of other iodide compounds.
  • Used to densify the copper castings described in a paper before the Electrochemical Society.

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