Rubidium bromide

Rubidium bromide
IUPAC name	Rubidium bromide
Other names	Rubidium(I) bromide
Identifiers
CAS number	7789-39-1 Y
PubChem	4670918
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
Y (what is this?)  (verify) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
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 neutralise rubidium carbonate with hydrobromic acid:

Rb₂CO₃ + 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

• WebElements. URL accessed March 1, 2006.

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