Barium bromide

inorganic compound

Barium bromide is a inorganic compound , the molecular formula is BaBr two , can be used for photography. It is easily soluble in water Ionic compound , can form dihydrate.

Chinese name: Barium bromide
Foreign name: Barium dibromide
chemical formula: BaBr two
molecular weight: two hundred and ninety-seven point one three five
CAS login number: 10553-31-8
EINECS login number: 234-140-0
Melting point: 880 ℃

Boiling point: Decomposition before boiling point
Density: 4.78 g/cm³
Application: It is used as an analytical reagent and also for the preparation of bromide
English nicknames: Barium bromide
InChI: InChI=1/Ba.2BrH/h;2*1H/q+2;;/p-2
molecular structure: Br-Ba-Br
Vapor pressure: 20200mmHg at 25°C

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Physical properties

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The crystal structure of barium bromide is Lead chloride Structure, white rhombic crystal, easy to deliquescence.

In aqueous solution BaBr two Appears as a simple salt, barium bromide and Sulfate radical The ions react to produce barium sulfate Sedimentation.

BaBr two (aq) + SO four 2- (aq) = BaSO four (s) + 2Br - (aq)

Similar reactions occurred oxalate 、 hydrofluoric acid and phosphoric acid 。

preparation

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Barium bromide available Barium sulfide or barium carbonate And Hydrobromic acid The reaction produces hydrated barium bromide. This happened in a very short time:

BaS + HBr = BaBr two + H two S

BaCO three 2- + HBr = BaBr two + CO two + H two O

Barium bromide dihydrate BaBr can be crystallized from the solution two ·2H two O， When heated to 120 ° C, it becomes anhydrous barium bromide.

purpose

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Barium bromide and other bromide compounds are sometimes used in photography. Historically, barium bromide was formed by Madame Curie It is used to separate and crystallize radium in the process of purification. Since radium precipitation is prior to barium bromide, it precipitates in solution radium The proportion of barium Scale of.

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