Barium iodide

• Barium iodatum
• Baryta jodata

Colorless and odorless, crystalline powder, hygroscopic

• 391.15 g · mol -1 ( pure substance)
• 427.167 g · mol -1 ( dihydrate)

Fixed

• 5.15 g · cm -3 ( 25 ° C) ( pure substance)
• 4.916 g · cm -3 ( dihydrate)

740 ° C.

Decomposition

• Well in water: 170g/100ml (0 ° C)
• Well in ethanol

Attention

-602.1 KJ / mol

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Barium iodide is the barium salt of hydriodic acid.

Production

Barium iodide can be represented by the reaction of hydrogen iodide with barium carbonate.

Likewise, it may be made of barium and iodine in the presence of a reducing agent, such as phosphorus or sulfur dioxide are produced.

Also possible is the preparation by reacting with ammonium Bariumhydrid in pyridine.

Properties

Barium iodide is hygroscopic crystals and often occurs BAI2 · 2 H2O as the dihydrate on. The dihydrate is at 150 ° C from its water of crystallization. It is very soluble in water, the solubility decreases with increasing temperature. From the aqueous solution precipitates a white precipitate of barium sulfate upon addition of sulfate ions.

Use

Barium iodide is under the name iodatum barium and Baryta jodata used in homeopathy.