Rubidium bromide
Encyclopedia
Rubidium bromide is the bromide
of rubidium
. It has a NaCl
crystal structure, with a lattice constant of 685 picometres.
There are several methods for synthesising rubidium bromide. One involves reacting rubidium hydroxide
with hydrobromic acid
:
Another method is to neutralize rubidium carbonate
with hydrobromic acid:
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.
Bromide
A bromide is a chemical compound containing bromide ion, that is bromine atom with effective charge of −1. The class name can include ionic compounds such as caesium bromide or covalent compounds such as sulfur dibromide.-Natural occurrence:...
of rubidium
Rubidium
Rubidium is a chemical element with the symbol Rb and atomic number 37. Rubidium is a soft, silvery-white metallic element of the alkali metal group. Its atomic mass is 85.4678. Elemental rubidium is highly reactive, with properties similar to those of other elements in group 1, such as very rapid...
. It has a NaCl
Sodium chloride
Sodium chloride, also known as salt, common salt, table salt or halite, is an inorganic compound with the formula NaCl. Sodium chloride is the salt most responsible for the salinity of the ocean and of the extracellular fluid of many multicellular organisms...
crystal structure, with a lattice constant of 685 picometres.
There are several methods for synthesising rubidium bromide. One involves reacting rubidium hydroxide
Rubidium hydroxide
Rubidium hydroxide is a strong basic chemical and alkali that is formed by one rubidium ion and one hydroxide ion.Rubidium hydroxide does not appear in nature. However it can be obtained by synthesis from rubidium oxide...
with hydrobromic acid
Hydrobromic acid
Hydrobromic acid is a strong acid formed by dissolving the diatomic molecule hydrogen bromide in water. "Constant boiling" hydrobromic acid is an aqueous solution that distills at 124.3 °C and contains 47.6% HBr by weight, which is 8.89 mol/L. Hydrobromic acid has a pKa of −9, making it a...
:
- RbOH + HBr → RbBr + H2O
Another method is to neutralize rubidium carbonate
Rubidium carbonate
Rubidium carbonate, Rb2CO3, is a convenient compound of rubidium; it is stable, not particularly reactive, and readily soluble in water, and is the form in which rubidium is usually sold.-Uses:...
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.