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Ammonium bromide (MF: NH₄Br, MW: 97.94) is an inorganic halide. At room temperature, it is a white, cubic crystalline powder that is odorless, has a salty taste, and is slightly hygroscopic. It is highly soluble in water, methanol, and ethanol, and slightly soluble in diethyl ether. It is widely used in the fields of photochemical materials, flame retardants, water treatment, and analytical chemistry, serving as an important component of photochemical emulsions, a flame retardant, and a bromine source reagent.
| Item | Specification |
| Melting Point | 452°C(lit.) |
| Boiling Point | 396°C/1 atm(lit.) |
| Density | 2.43 g/mL at 25°C(lit.) |
| Flash Point | N/A |
| Vapor Pressure | 1 mmHg (198.3°C) |
| PSA | 3.24 |
| Thermal conductivity | 2.51 W/(m·K) |
| Solubility | Soluble in water, methanol, ethanol, and acetone; slightly soluble in diethyl ether; practically insoluble in ethyl acetate. |
| Hygroscopicity | Slightly hygroscopic; decomposes slightly when exposed to air, releasing a small amount of bromine and turning yellow. |
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