Rubidium fluoride

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Rubidium fluoride
Rubidium fluoride
CAS number 13446-74-7 YesY
PubChem 83473
ChemSpider 75311 YesY
RTECS number VL8740000
Jmol-3D images Image 1
Molecular formula RbF
Molar mass 104.4662 g/mol
Appearance white crystalline solid
Density 3.557 g/cm3
Melting point 795 °C (1068 K)
Boiling point 1408 °C (1681 K)
Solubility in water 130.6 g/100 mL (18 °C)
EU Index Not listed
Main hazards Toxic
Flash point Non-flammable
Related compounds
Other anions Rubidium chloride
Rubidium bromide
Rubidium iodide
Other cations Lithium fluoride
Sodium fluoride
Potassium fluoride
Caesium fluoride
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 fluoride (RbF) is the fluoride salt of rubidium. It is a cubic crystal with rock-salt structure.

There are several methods for synthesising rubidium fluoride. One involves reacting rubidium hydroxide with hydrofluoric acid:

RbOH + HF → RbF + H2O

Another method is to neutralize rubidium carbonate with hydrofluoric acid:

Rb2CO3 + 2HF → 2RbF + H2O + CO2

Another less commonly used method is to react rubidium hydroxide with ammonium fluoride:

RbOH + NH4F → RbF + H2O + NH3

The least used method due to expense of rubidium metal is to react it directly with fluorine gas, as rubidium reacts violently with halogens:

2Rb + F2 → 2RbF