Rubidium bromide
Chemical compound
From Wikipedia, the free encyclopedia
Rubidium bromide is an inorganic compound with the chemical formula RbBr. It is a salt of hydrogen bromide. It consists of bromide anions Br− and rubidium cations Rb+. It has a NaCl crystal structure, with a lattice constant of 685 picometres.[2]
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| Names | |
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| IUPAC name
Rubidium bromide | |
| Other names
Rubidium(I) bromide | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.029.238 |
PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties[1] | |
| RbBr | |
| Molar mass | 165.372 g/mol |
| Appearance | white crystalline solid |
| Density | 3.35 g/cm3 |
| Melting point | 682 °C (1,260 °F; 955 K) |
| Boiling point | 1,340 °C (2,440 °F; 1,610 K) |
| 47.26 g/100 mL (0.5°C) 53.69 g/100 mL (25°C) 67.24 g/100 mL (113.5°C) | |
| −56.4·10−6 cm3/mol[citation needed] | |
| Hazards | |
| Flash point | Non-flammable |
| Thermochemistry | |
Enthalpy of fusion (ΔfH⦵fus) |
15.50 kJ/mol[1] |
| Related compounds | |
Other anions |
Rubidium fluoride Rubidium chloride Rubidium iodide Rubidium astatide |
Other cations |
Lithium bromide Sodium bromide Potassium bromide Caesium bromide Francium bromide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation
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 + 2 HBr → 2 RbBr + H2O + CO2
