Rubidium bromide

Rubidium bromide
Names
	IUPAC name Rubidium bromide
	Other names Rubidium(I) bromide
Identifiers
CAS Number	7789-39-1 ;
3D model (JSmol)	Interactive image;
ChemSpider	74217 ;
ECHA InfoCard	100.029.238
PubChem CID	4670918;
UNII	33CM31XVQQ ;
CompTox Dashboard (EPA)	DTXSID00894885 ;
	InChI InChI=1S/BrH.Rb/h1H;/q;+1/p-1 Key: JAAGVIUFBAHDMA-UHFFFAOYSA-M ; InChI=1/BrH.Rb/h1H;/q;+1/p-1 Key: JAAGVIUFBAHDMA-REWHXWOFAB;
	SMILES [Rb+].[Br-];
Properties
Chemical formula	RbBr
Molar mass	165.372 g/mol
Appearance	white crystalline solid
Density	3.350 g/cm3
Melting point	693 °C (1,279 °F; 966 K)
Boiling point	1,340 °C (2,440 °F; 1,610 K)
Solubility in water	98 g/100 mL
Magnetic susceptibility (χ)	−56.4·10−6 cm3/mol
Hazards
Flash point	Non-flammable
Related compounds
Other anions	Rubidium fluoride; Rubidium chloride; Rubidium iodide; Rubidium astatide
Other cations	Lithium bromide; Sodium bromide; Potassium bromide; Caesium bromide; Francium bromide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Rubidium bromide is an inorganic compound with the chemical formula Rb Br. It is a salt of hydrogen bromide. It consists of bromide anions Br⁻ and rubidium cations Rb⁺. 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:

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.