Rubidium bromide
| Rubidium bromide | |
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Rubidium bromide |
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Other names
Rubidium(I) bromide |
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| Identifiers | |
| CAS number | 7789-39-1  |
| PubChem | 4670918 |
| ChemSpider | 74217 |
| Jmol-3D images | Image 1 |
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| Properties | |
| Molecular formula | RbBr |
| Molar mass | 165.372 g/mol |
| Appearance | white crystalline solid |
| Density | 3.350 g/cm3 |
| Melting point |
693 °C, 966 K, 1279 °F |
| Boiling point |
1340 °C, 1613 K, 2444 °F |
| Solubility in water | 98 g/100 mL |
| Hazards | |
| EU Index | Not listed |
| Flash point | Non-flammable |
| Related compounds | |
| Other anions | Rubidium fluoride Rubidium chloride Rubidium iodide |
| Other cations | Lithium bromide Sodium bromide Potassium bromide Caesium bromide |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
Rubidium bromide is the bromide of rubidium. It has a NaCl crystal structure, with a lattice constant of 685 picometres. [1]
There are several methods for synthesising rubidium bromide. One involves reacting rubidium hydroxide with hydrobromic acid:
- RbOH + HBr → RbBr + H2O
Another method is to neutralize rubidium carbonate with hydrobromic acid:
- Rb2CO3 + 2HBr → 2RbBr + H2O + CO2
Rubidium metal would react directly with bromine to form RbBr, but this is not a sensible production method since rubidium metal is substantially more expensive than the carbonate or hydroxide; moreover, the reaction would be explosive.
[edit] References
- ^ G. Chern, J. G. Skofronick, W. P. Brug ,S. A. Safron (1989). "Surface phonon modes of the RbBr(001) crystal surface by inelastic He-atom scattering". Phys. Rev. B 39 (17): 12838–12844. doi:10.1103/PhysRevB.39.12838.
- WebElements. URL accessed March 1, 2006.
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