Rubidium fluoride

Rubidium fluoride (RbF) is the fluoride salt of rubidium. It is a cubic crystal with rock-salt structure.

Rubidium fluoride

Names
Other names Rubidium(I) Fluoride
Identifiers
CAS Number	13446-74-7 Y
3D model (JSmol)	Interactive image
ChemSpider	75311 Y
ECHA InfoCard	100.033.262
PubChem CID	83473
RTECS number	VL8740000
UNII	63564TNJ4R Y
CompTox Dashboard (EPA)	DTXSID7065463
InChI InChI=1S/FH.Rb/h1H;/q;+1/p-1 Y Key: AHLATJUETSFVIM-UHFFFAOYSA-M Y InChI=1/FH.Rb/h1H;/q;+1/p-1 Key: AHLATJUETSFVIM-REWHXWOFAO
SMILES [Rb+].[F-]
Properties
Chemical formula	RbF
Molar mass	104.4662 g/mol
Appearance	white crystalline solid
Density	3.557 g/cm3
Melting point	795 °C (1,463 °F; 1,068 K)
Boiling point	1,408 °C (2,566 °F; 1,681 K)
Solubility in water	130.6 g/100 mL (18 °C)
Magnetic susceptibility (χ)	−31.9·10−6 cm3/mol
Hazards
Main hazards	Toxic
NFPA 704 (fire diamond)	0 3 0
Flash point	Non-flammable
Related compounds
Other anions	Rubidium chloride Rubidium bromide Rubidium iodide Rubidium astatide
Other cations	Lithium fluoride Sodium fluoride Potassium fluoride Caesium fluoride Francium fluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

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 possible 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