Sodium Bromide

Sodium bromide is an inorganic compound with the formula NaBr. It is a high-melting white, crystalline solid that resembles sodium chloride.

Physical Properties:

Chemical formula：NaBr

Molar mass：102.894 g·mol−1

Appearance：White powder, hygroscopic

Density： 3.21 g/cm3 (anhydrous)/2.18 g/cm3 (dihydrate)

Melting point：747 °C (1,377 °F; 1,020 K) (anhydrous)/36 °C (97 °F; 309 K) (dihydrate) decomposes

Boiling point：1,390 °C (2,530 °F; 1,660 K)

Solubility in water：71.35 g/100 mL (−20 °C)/79.52 g/100 mL (0 °C)/94.32 g/100 mL (25 °C)/104.9 g/100 mL (40 °C)/116.2 g/100 mL (100 °C)

Crystal structure：Cubic

Applications:

Pharmaceuticals: Sodium bromide has been historically used as a sedative and anticonvulsant in medicine, although it has largely been replaced by other medications today. It was once used in the treatment of epilepsy and anxiety disorders.

Photography: Sodium bromide is used in photographic processes, particularly in the preparation of photographic emulsions. It reacts with silver nitrate to form silver bromide, which is light-sensitive and crucial for traditional film development.

Water Treatment: Sodium bromide is used in water treatment, particularly in cooling tower water and swimming pools, where it can act as a disinfectant or a biocide. It can help control algae and bacteria growth.

Industrial Applications: Sodium bromide is used in the preparation of other bromine compounds, such as hydrogen bromide (HBr) and brominated flame retardants. It also has uses in the oil and gas industry, where it is used in drilling fluids.

Chemical Synthesis: Sodium bromide serves as a source of bromine in various chemical syntheses, such as the production of brominated compounds used in the pharmaceutical and agrochemical industries.

Safety Considerations:

Toxicity: Sodium bromide is relatively low in toxicity, but like most bromide compounds, it can be harmful if ingested in large quantities. Ingestion or inhalation of large amounts can cause respiratory issues or gastrointestinal distress. Inhalation of the dust may cause irritation to the respiratory tract and eyes.

Handling and Storage: Sodium bromide should be handled with care, especially in powder form, to avoid inhalation of dust. It should be stored in a cool, dry place away from strong oxidizing agents, acids, and moisture to prevent degradation or unwanted reactions.