Rubidium bromide

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

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.