Difference between revisions of "Silver bromide"
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Latest revision as of 21:17, 9 January 2022
| Names | |
|---|---|
| IUPAC name
Silver bromide
| |
| Other names
Argentous bromide
Bromargyrite Bromyrite Silver(I) bromide | |
| Properties | |
| AgBr | |
| Molar mass | 187.77 g/mol |
| Appearance | Pale yellow solid |
| Odor | Odorless |
| Density | 6.473 g/cm3 |
| Melting point | 432 °C (810 °F; 705 K) |
| Boiling point | 700 °C (1,292 °F; 973 K) (decomposes) |
| 0.140 mg/l (20 °C) | |
| Solubility | Soluble in alkali cyanide solutions Sparingly soluble in ammonia Insoluble in alcohols |
| Solubility in ammonia | 2.4 g/100 g (0 °C)[1] |
| Vapor pressure | ~0 mmHg |
| Thermochemistry | |
| Std molar
entropy (S |
107 J·mol−1·K−1 |
| Std enthalpy of
formation (ΔfH |
−100 kJ/mol |
| Hazards | |
| Safety data sheet | Fisher |
| Flash point | Non-flammable |
| Related compounds | |
| Related compounds
|
Silver(I) fluoride Silver chloride Silver iodide |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Silver bromide is a soft, pale-yellow, light-sensitive water-insoluble salt, with the formula AgBr.
Contents
Properties
Chemical
Silver bromide reacts readily with liquid ammonia to generate a variety of ammine complexes, like Ag(NH
3)
2Br and Ag(NH
3)
2Br−
2.
Silver bromide will slowly decompose when exposed to light into silver metal and bromine:
- 2 AgBr → 2 Ag + Br2
Physical
Silver bromide is a pale yellow solid, sensitive to light. It is insoluble in water and most solvents.
Availability
Silver bromide can be bought from chemical suppliers.
AgBr can be found naturally as the mineral bromargyrite.
Preparation
Silver bromide is extremely easy to prepare by metathesis reaction: a soluble bromide salt, like NaBr is added as solution to a solution of a soluble silver salt, such as silver nitrate. Due to its extremely low solubility, silver bromide will precipitate out of the solution, and can be filtered from the resulting suspension, washed and then dried.
- AgNO3 + NaBr → NaNO3 + AgBr
Projects
- Make photographic paper (photography)
- Compound collecting
Handling
Safety
Silver bromide may be harmful if ingested in large amounts, but usually it doesn't pose a serious health risk. May cause silver stains though.
Storage
In closed amber glass or plastic bottles, away from light and reducing agents.
Disposal
Since silver is expensive, AgBr should be recycled. This can be done by reducing the compound to Ag metal, which is then collected and stored for further uses.
References
- ↑ Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977 (Rabinovich V.A., Khavin Z.Ya. A short chemical reference book. - L .: Chemistry, 1977)
