Lithium bromide CAS 7550-35-8

Lithium bromide, with the CAS number 7550-35-8, is a chemical compound represented by the formula LiBr. It is a white, crystalline, and hygroscopic solid that is highly soluble in water, alcohol, and ether. This compound is notable for its low vapor pressure in aqueous solutions, making it useful in various applications, particularly in the field of chemistry and industry.
Physical Properties
Molecular Weight: 86.845 g/mol
Density: Approximately 3.46 g/cm³
Melting Point: 552 °C
Boiling Point: 1,265 °C
Solubility: Lithium bromide is soluble in water (up to 266 g/100 mL at 100 °C), methanol, ethanol, ether, and acetone.
Chemical Properties
Lithium bromide is an ionic compound consisting of lithium ions (Li⁺) and bromide ions (Br⁻). It can participate in various chemical reactions, such as single displacement reactions where it can react with chlorine to form lithium chloride and bromine.
Applications
Lithium bromide is widely used in several industrial applications, including:
Desiccant: Due to its hygroscopic nature, it is effective in absorbing moisture from the air, making it useful in drying applications.
Refrigeration: It is employed in absorption chillers, where it acts as a refrigerant.
Catalyst: Lithium bromide can serve as a catalyst in organic synthesis, particularly in reactions involving epoxide ring-opening.
Safety and Handling
While lithium bromide is generally considered safe for use in controlled environments, it is important to handle it with care due to its hygroscopic properties and potential health hazards. Proper safety measures should be taken to avoid inhalation or skin contact.
In summary, lithium bromide (LiBr) is a versatile compound with significant physical and chemical properties that make it valuable in various industrial and chemical processes.