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Lithium bromide

CAS number : 7550-35-8

Molecular weight :86.84

Molecular formula/chemical symbol :LiBr

Description :

Lithium bromide, or LiBr, is a chemical compound of lithium and bromine. Its extreme hygroscopic character makes LiBr useful as a desiccant in certain air conditioning systems.

LiBr is prepared by treatment of lithium carbonate with hydrobromic acid. The salt forms several crystalline hydrates, unlike the other alkali metal bromides. The anhydrous salt forms cubic crystals similar to common salt.

Lithium Hydroxide and Hydrobromic Acid (Aqueous solution of Hydrogen Bromide) will precipitate Lithium Bromide in the presence of water.

LiOH + HBr → LiBr + H2O

Lithium bromide

IUPAC name[hide]

Lithium bromide

Identifiers

CAS number

7550-35-8 YesY

PubChem

82050

ChemSpider

74049 YesY

UNII

864G646I84 YesY

EC number

231-439-8

RTECS number

OJ5755000

Jmol-3D images

Image 1

Properties

Molecular formula

LiBr

Molar mass

86.845(3) g/mol

Appearance

White solid
hygroscopic

Density

3.464 g/cm3

Melting point

552 °C

Boiling point

1265 °C

Solubility in water

145 g/100 mL (4 °C)
166.7 g/100 mL (20 °C)
254 g/100 mL (90 °C)

Solubility

soluble in methanol, ethanol, ether
slightly soluble in pyridine

Refractive index (nD)

1.784

Thermochemistry

Std enthalpy of
formation
ΔfHo298

-4.044 kJ/g

Hazards

EU Index

Not listed

Flash point

not flammable

Related compounds

Other anions

Lithium fluoride
Lithium chloride
Lithium iodide

Other cations

Sodium bromide
Potassium bromide
Rubidium bromide
Caesium bromide

 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

USES :

Lithium bromide is used in air-conditioning systems as desiccant.

Otherwise the salt is useful as a reagent in organic synthesis. For example it reversibly forms adducts with some pharmaceuticals.

Report :

Product name

Lithium bromide

CAS7550-35-8

 

Description

White cubic crystalline or granular powder

 

TEST ITEMS

TEST RESULTS

 

 

LiBr Content is not less than (%)

99.0

99.5

 

The

impurity

content

is

not

greater than

 (%)

Ca

0.01

0.005

 

Mg

0.005

0.0005

 

Fe

0.001

0.0002

 

Cl

0.1

0.05

 

SO4

0.04

0.02

 

Water insoluble matter

0.04

0.02

 

H2O

0.8

0.4