Sodium bromide
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.
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| IUPAC name
Sodium bromide | |
| Identifiers | |
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| ECHA InfoCard | 100.028.727 |
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| Properties | |
| 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) |
| 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) | |
| Solubility | Soluble in alcohol, liquid ammonia, pyridine, hydrazine, SO2 Insoluble in acetone, acetonitrile |
| Solubility in methanol | 17.3 g/100 g (0 °C) 16.8 g/100 g (20 °C) 16.1 g/100 g (40 °C) 15.3 g/100 g (60 °C) |
| Solubility in ethanol | 2.45 g/100 g (0 °C) 2.32 g/100 g (20 °C) 2.29 g/100 g (30 °C) 2.35 g/100 g (70 °C) |
| Solubility in formic acid | 19.3 g/100 g (18 °C) 19.4 g/100 g (25 °C) |
| Solubility in glycerol | 38.7 g/100 g (20 °C) |
| Solubility in dimethylformamide | 3.2 g/100 g (10.3 °C) |
| Vapor pressure | 1 torr (806 °C) 5 torr (903 °C) |
| −41.0·10−6 cm3/mol | |
| Thermal conductivity | 5.6 W/(m·K) (150 K) |
Refractive index (nD) |
1.6428 (24 °C) nKrF = 1.8467 (24 °C) nHe–Ne = 1.6389 (24 °C) |
| Viscosity | 1.42 cP (762 °C) 1.08 cP (857 °C) 0.96 cP (937 °C) |
| Structure | |
| Cubic | |
a = 5.97 Å | |
| Thermochemistry | |
Heat capacity (C) |
51.4 J/(mol·K) |
Std molar entropy (S⦵298) |
86.82 J/(mol·K) |
Std enthalpy of formation (ΔfH⦵298) |
−361.41 kJ/mol |
Gibbs free energy (ΔfG⦵) |
−349.3 kJ/mol |
| Pharmacology | |
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| Hazards | |
| NFPA 704 (fire diamond) | |
| Flash point | 800 °C (1,470 °F; 1,070 K) |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
3500 mg/kg (rats, oral) |
| Safety data sheet (SDS) | External MSDS |
| Related compounds | |
Other anions |
Sodium fluoride Sodium chloride Sodium iodide Sodium astatide |
Other cations |
Lithium bromide Potassium bromide Rubidium bromide Caesium bromide Francium bromide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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