Rubidium bromide

Chembox new
ImageFile = Rubidium-bromide-3D-ionic.png ImageName = Rubidium bromide
IUPACName = Rubidium bromide
OtherNames = Rubidium(I) bromide
Section1 = Chembox Identifiers
CASNo = 7789-39-1
Section2 = Chembox Properties
Formula = RbBr
MolarMass = 165.372 g/mol
Appearance = white crystalline solid
Density = 3350 kg m^-3 when solid
MeltingPt = 693°C / 966K
Section8 = Chembox Related
OtherAnions = rubidiumcompounds
OtherCations = Lithium bromide
Sodium bromide
Potassium bromide
Caesium bromide
and all other bromides

Rubidium bromide is the bromide of rubidium. It has a face-centred-cubic crystal structure, with a lattice constant of 6.85 angstrom [http://link.aps.org/doi/10.1103/PhysRevB.39.12838] .

There are several methods for synthesising rubidium bromide. One involves reacting rubidium hydroxide with hydrobromic acid:

:RbOH + HBr → RbBr + H₂O

Another method is to neutralise rubidium carbonate with hydrobromic acid:

:Rb₂(CO₃) + 2HBr → 2RbBr + H₂O + CO₂

Rubidium metal would react directly with bromine to form RbBr, but this isn't a sensible production method since rubidium metal is substantially more expensive than the carbonate or hydroxide; moreover, the reaction would be explosive.

References

* [http://www.webelements.com/webelements/compounds/text/Rb/Br1Rb1-7789391.html WebElements] . URL accessed March 1, 2006.