Sodium bromide

Sodium bromide
Sodium bromide
CAS number 7647-15-6 YesY
13466-08-5 (dihydrate)
PubChem 253881
ChemSpider 22712 YesY
RTECS number VZ3150000
Jmol-3D images Image 1
Molecular formula NaBr
Molar mass 102.894 g/mol
Appearance White powder
Density 3.21 g/cm3 (anhydrous)
2.18 g/cm3 (dihydrate)
Melting point

747 °C (anhydrous)
36 °C (dihydrate)

Boiling point

1396 °C

Solubility in water 90.5 g/100 mL (20 °C) 121.0 g/100 mL (100 °C)
Solubility in methanol 16.7 g/100mL
Refractive index (nD) 1.6459
MSDS External MSDS[dead link]
EU Index Not listed
Flash point 800 °C
LD50 3500 mg/kg
Related compounds
Other anions Sodium fluoride
Sodium chloride
Sodium iodide
Other cations Lithium bromide
Potassium bromide
Rubidium bromide
Caesium bromide
 N (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Sodium bromide is an inorganic compound with the formula NaBr. It is a high-melting white, crystalline solid that resembles sodium chloride. It is a widely used source of the bromide ion and has many applications.[1]


Synthesis, structure, reactions

NaBr crystallizes in the same cubic motif as NaCl, NaF and NaI. It is produced by treating sodium hydroxide with hydrogen bromide. The anhydrous salt crystallizes above 50.7 °C.[1]

Sodium bromide can be used as a source of the chemical element bromine. This can be accomplished by treating an aqueous solution of NaBr with chlorine gas:

2 NaBr + Cl2 → Br2 + 2 NaCl


Sodium bromide is the most useful inorganic bromide in industry.[1]


Also known as Sedoneural, sodium bromide has been used as a hypnotic, anticonvulsant, and sedative in medicine , widely used as an anticonvulsant and a sedative in the late 19th and early 20th centuries. Its action is due to the bromide ion, and for this reason potassium bromide is equally effective.[2]

Preparation of other bromine compounds

Sodium bromide is widely used for the preparation of other bromides in organic synthesis and other areas. It is a source of the bromide nucleophile to convert alkyl chlorides to more reactive alkyl bromides by the Finkelstein reaction:

NaBr + RCl → RBr + NaCl (R = alkyl)

Once a large need in photography, but now shrinking, the photosensitive salt silver bromide is prepared using NaBr.


NaBr is used in conjunction with chlorine as a disinfectant for swimming pools.

Petroleum industry

Sodium bromide is used to prepare dense fluids used in oil wells.


NaBr has a very low toxicity with an oral LD50 estimated at 5 g/kg for rats.


  1. ^ a b c Michael J. Dagani, Henry J. Barda, Theodore J. Benya, David C. Sanders "Bromine Compounds" in Ullmann's Encyclopedia of Industrial Chemistry" Wiley-VCH, Weinheim, 2000.doi:10.1002/14356007.a04_405
  2. ^ Bromide

External links

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Look at other dictionaries:

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