Barium Iodide - BaI2

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.

Frequently Asked Questions

What are the uses of barium iodide?

Barium iodide is widely used in the manufacturing of other important compounds of iodine. This compound is also used to prepare barium dioxide.

Is barium iodide covalent or ionic?

An ionic compound is solid composed of ions charged oppositely. Such compounds form solution when dissolved in water, which allows the conduction of electrical current. Having said that, Barium iodide is an ionic compound.

Comment on the structure of barium iodide.

The anhydrous type structure resembles lead(II) chloride (PbCl2) where each barium centre is bound to nine iodide ligands. The crystalline packing structure is very similar to BaCl2.  

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