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Lithium bromide ( LiBr) is a chemical compound of and . Its extreme character makes LiBr useful as a in certain systems.Wietelmann, Ulrich and Bauer, Richard J. (2005) "Lithium and Lithium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry Wiley-VCH: Weinheim.


Production and properties
LiBr is prepared by treating an aqueous suspension of lithium carbonate with or by reacting lithium hydroxide with bromine. It forms several crystalline hydrates, unlike the other alkali metal bromides.

Lithium hydroxide and hydrobromic acid (aqueous solution of hydrogen bromide) will precipitate lithium bromide in the presence of water.

LiOH + HBr → LiBr + H2O


Uses
A 50–60% aqueous solution of lithium bromide is used in air-conditioning systems as . It is also used in absorption chilling along with water (see absorption refrigerator). Solid LiBr is a useful reagent in organic synthesis. It is included into oxidation and catalysts; it is also used for deprotonation and dehydration of organic compounds containing acidic protons, and for the purification of and .


Medical applications
Lithium bromide was used as a beginning in the early 1900s, but it fell into disfavor in the 1940s as newer sedatives became available and when some heart patients died after using the salt substitute lithium chloride. Like lithium carbonate and , it was used as treatment for .


Hazards
are and somewhat corrosive. Heat is quickly generated when lithium bromide is dissolved into water because it has a negative enthalpy of solution.


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