Rubidium hydroxide

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Rubidium hydroxide
CAS number 1310-82-3 YesY
PubChem 62393
ChemSpider 56181 YesY
ChEBI CHEBI:32108 YesY
RTECS number VL8750000
Jmol-3D images Image 1
Molar mass 102.475 g/mol
Appearance grayish-white solid,
Density 3.203 g/cm3
Melting point 301 °C
Boiling point 1390 °C
Solubility in water 100 g/100 mL (15 °C)
Solubility soluble in ethanol
Std enthalpy of
−413.8 kJ/mol
EU Index Not listed
Main hazards Corrosive
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 3: Short exposure could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g., calcium Special hazards (white): no codeNFPA 704 four-colored diamond
Flash point Non-flammable
Related compounds
Other cations Lithium hydroxide
Sodium hydroxide
Potassium hydroxide
Caesium hydroxide
Related compounds Rubidium oxide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Rubidium hydroxide (RbOH) 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. In addition, rubidium hydroxide is commercially available in form of an aqueous solution from a few suppliers.

Rubidium hydroxide is highly corrosive, therefore suitable protective clothing, gloves and eye-face protection are required when handling this material.


Rubidium hydroxide can be synthesized from rubidium oxide by dissolving the oxide into water:

Rb2O (s) + H2O (l) → 2 RbOH (aq)

Rubidium hydroxide is also commercially available from a certain number of chemical suppliers in form of 50% or 99% aqueous solution at multiples of 5 g.


Rubidium hydroxide is rarely used in industrial processes because potassium hydroxide and sodium hydroxide can perform nearly all the industrial functions of rubidium hydroxide in a less violent and hence safer way.

Rubidium hydroxide is used in scientific research. It is often used sparingly to prevent waste of the expensive element rubidium. For example, it is used to give fireworks a violet color in place of pure rubidium.

Despite the fact that rubidium hydroxide is rarely used in normal industrial processes, it is notable that the synthesis of nearly all rubidium compounds involves rubidium hydroxide as an intermediate. Natural rubidium oxide is added to water, and the resulting reaction forms soluble rubidium hydroxide as a product.

Hazard prevention[edit]

Rubidium hydroxide is a corrosive compound that causes immediate burns to the skin on contact. Ultimate care must be carried out when handling this chemical.

In the laboratory, protective clothing, gloves, and eye-face protection made from alkali-resistant materials are to be worn to prevent injury caused by accidental leakage of rubidium hydroxide onto human skin.

Dilution of this strong alkali must be done by adding the hydroxide slowly into the beaker of water.

In addition, chemical experiments on this compound must be performed with caution to prevent the great amount of heat released in an exothermic reaction from causing the solution to boil-over or damage the vessel.

See also[edit]