Rubidium bromide

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Rubidium bromide

IUPAC name	Rubidium bromide
Other names	Rubidium(I) bromide
Identifiers
CAS number	[7789-39-1]
Properties
Molecular formula	RbBr
Molar mass	165.372 g/mol
Appearance	white crystalline solid
Density	3350 kg m^-3 when solid
Melting point	693°C / 966K
Related compounds
Other anions	Rubidium fluoride Rubidium chloride Rubidium bromide Rubidium iodide Rubidium hydride Rubidium hydroxide Rubidium oxide Rubidium sulfide Rubidium selenide Rubidium telluride
Other cations	Lithium bromide Sodium bromide Potassium bromide Caesium bromide and all other bromides
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Rubidium bromide is the bromide of rubidium. It has a face-centred-cubic crystal structure, with a lattice constant of 6.85 angstrom [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 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.