Rubidium bromide

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Rubidium bromide
Rubidium bromide
CAS number 7789-39-1 YesY
PubChem 4670918
ChemSpider 74217 YesY
Jmol-3D images Image 1
Molecular formula RbBr
Molar mass 165.372 g/mol
Appearance white crystalline solid
Density 3.350 g/cm3
Melting point 693 °C (1,279 °F; 966 K)
Boiling point 1,340 °C (2,440 °F; 1,610 K)
Solubility in water 98 g/100 mL
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
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 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.


  1. ^ 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.