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Sodium bromide
From Wikipedia, the free encyclopedia
| Sodium bromide | |
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| General | |
| Systematic name | Sodium bromide |
| Other names | |
| Molecular formula | NaBr |
| Molar mass | 102.894 g/mol |
| Appearance | White powder |
| CAS number | [7647-15-6] |
| Properties | |
| Density and phase | 3.21 g/cm3, solid |
| Solubility in water | 73.3 g/100 mL (20 °C) 116.0 g/100 mL (50 °C) |
| Other solvents | ethanol, acetone |
| Melting point | 755 °C |
| Boiling point | 1390 °C |
| Hazards | |
| MSDS | External MSDS |
| EU classification | mild irritant (I) |
| R-phrases | R36, R37, R38. |
| S-phrases | S26, S37, S39. |
| NFPA 704 | N/A |
| Flash point | Non-flammable. |
| Supplementary data page | |
| Structure and properties |
n, εr, etc. |
| Thermodynamic data |
Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Related compounds | |
| Other anions | NaCl |
| Other cations | KBr |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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Sodium bromide is a salt with the formula NaBr, widely used as an anticonvulsant and a sedative in the late 19th and early 20th centuries. Its action is due to the bromide ion (potassium bromide is equally effective). It is a high-melting white, crystalline solid that resembles sodium chloride. It is a widely used source of the bromide ion.
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NaBr is widely used in organic synthesis as a nucleophile to convert organochlorine compounds to organobromine derivatives, which are more usefully (selectively) reactive.
- NaBr + RCl → RBr + NaCl
- Sodium bromide can be used as a source of the chemical element bromine. This can be accomplished by bubbling chlorine gas through an aqueous solution of NaBr.
- As a source of HBr, NaBr is treated with a strong, non-volatile acid:
- NaBr + H3PO4 → HBr + NaHPO4
HBr can also be oxidized to Br2 using MnO2 or concentrated H2SO4.
- as a hypnotic, anticonvulsant, and sedative in medicine. As a source of the bromide ion, which is pharmacologically active, it is equivalent to potassium bromide (see this article for more complete discussion of this topic).
- in photography
- to establish a bromide ion reserve in a bromine spa (hot tub) antimicrobial treatment regimen.
NaBr is sold under the brand name Sedoneural.
NaBr is harmful if swallowed or inhaled in large amounts, affecting the central nervous system, brain, and eyes (see potassium bromide). The compound causes irritation to the skin, eyes and respiratory system.
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