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| Identifiers | |
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3D model (JSmol) | |
| ChemSpider |
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| ECHA InfoCard | 100.031.024 |
| EC Number |
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| UNII | |
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| Properties | |
| BaBr2 (anhydrous) BaBr2·2H2O (dihydrate) | |
| Molar mass | 297.14 g/mol |
| Appearance | White solid |
| Density | 4.78 g/cm3 (anhydrous) 3.58 g/cm3 (dihydrate) |
| Melting point | 857 °C (1,575 °F; 1,130 K) |
| Boiling point | 1,835 °C (3,335 °F; 2,108 K) |
| 92.2 g/100 mL (0°C) | |
| -92.0·10−6 cm3/mol | |
| Structure | |
| PbCl2-type (orthorhombic,oP12) | |
| Pnma (No. 62) | |
| Thermochemistry | |
Std enthalpy of formation(ΔfH⦵298) | −181.1 kcal/mol |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards | Toxic |
| GHS labelling: | |
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| Warning | |
| H302,H332 | |
| P261,P264,P270,P271,P301+P312,P304+P312,P304+P340,P312,P330,P501 | |
| NFPA 704 (fire diamond) | |
| Safety data sheet (SDS) | NIH BaBr |
| Related compounds | |
Otheranions | Barium fluoride Barium chloride Barium iodide |
Othercations | Beryllium bromide Magnesium bromide Calcium bromide Strontium bromide Radium bromide Lead bromide |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Barium bromide is thechemical compound with theformula BaBr2. It isionic andhygroscopic in nature.
BaBr2 crystallizes in thelead chloride (cotunnite) motif, giving whiteorthorhombiccrystals that aredeliquescent.[1][2]
| Ion | Ba2+ | Br− (tetrahedral) | Br− (trigonal) |
|---|---|---|---|
| Coordination sphere | {BaBr9} | {BrBa4} | {BrBa3} |
| Ball-and-stick model |  |  |  |
| Coordination number | 9 | 4 | 3 |
| Coordination geometry | (7+2) coordination[5] distortedtricapped trigonal prismatic | distortedtetrahedral | trigonal pyramidal |
In aqueous solution BaBr2 behaves as a simplesalt.
Solutions of barium bromide reacts with thesulfatesalts to produce a solidprecipitate ofbarium sulfate.
Similar reactions occur withoxalic acid,hydrofluoric acid, andphosphoric acid, giving solid precipitates ofbarium oxalate, fluoride, and phosphate, respectively.
Barium bromide can be prepared by treatingbarium sulfide orbarium carbonate withhydrobromic acid:
Barium bromidecrystallizes from concentrated aqueous solution in its dihydrate, BaBr2·2H2O. Heating this dihydrate to 120 °C gives theanhydrous salt.[6]
Barium bromide is a precursor to chemicals used in photography and to otherbromides.
Historically, barium bromide was used to purifyradium in a process offractional crystallization devised byMarie Curie. Since radium precipitates preferentially in a solution of barium bromide, the ratio of radium to barium in the precipitate would be higher than the ratio in the solution.[7]
Barium bromide, along with other water-soluble barium salts (e.g.barium chloride), is toxic. However, there is no conclusive data available on its hazards.[8]
The compound appears in the introtitle card ofBreaking Bad, where the first pairs of letters are replaced with Br35 and Ba56, the symbols andatomic numbers ofbromine andbarium respectively.
