- Chinese name
- Silver bromide
- Foreign name
- Silver bromide
- chemical formula
- AgBr
- molecular weight
- one hundred and eighty-seven point seven seven two two
- CAS login number
- 7785-23-1
- Melting point
- 432 ℃
- Water solubility
- Insoluble in water
- Appearance
- Light yellow powder
- Application
- Color changing lens, photographic negative
- Control type
- Unregulated
- Dissolution of other solvents
- Insoluble in water and most alcohols, slightly soluble in ammonia
- Nature
- Easily decomposed when exposed to light
- decomposition temperature
- Above 1300 ℃
And Silver chloride Similarly, the most common preparation method of silver bromide is to use Hydrobromic acid or alkali metal Bromide And silver nitrate The reaction is obtained. Silver bromide is also used Bromargentite The form of "" exists in nature. Silver bromide is light yellow crystal Or powder, melting point 432 ℃, decomposition when heating above 1300 ℃. Odorless. See that the light color becomes darker. Soluble in Potassium cyanide Solution, almost insoluble in water ethanol And most acids. Insoluble in water, slightly soluble in ammonia , insoluble in Non oxidizing acid , but soluble in potassium cyanide Sodium thiosulfate Etc. Capable of being photosensitive and decomposable when exposed to light, and can be used to make photographic negatives or films Photosensitive layer 。 See photo decomposition equation ： 
Silver bromide light decomposition character expression Soluble in potassium cyanide: AgBr+2CN - =[Ag(CN) two ] - +Br -
Soluble in sodium thiosulfate: AgBr+2S two O three 2- =[Ag(S two O three ) two ] 3- +Br -
Soluble in Concentrated nitric acid :2AgBr+2NO three - +4H + =2Ag + +2NO two ↑+Br two +2H two O Silver bromide decomposes into silver and bromine at the sight of light, but after the light is weakened, silver and bromine can be combined again into silver bromide.
Chameleon lens Is on Ordinary glass A proper amount of silver bromide and Cupric oxide Microcrystalline particles. When exposed to strong light, silver bromide decomposes into silver and bromine. The tiny silver grains decomposed make the glass dark brown. When the light is dark, silver and bromine are found in the Catalysis Then, silver bromide is regenerated. As a result, the color of the lens becomes lighter AgBr is photosensitive and is commonly used in Photography Photographic negative , Print Photo paper Apply a thin layer of gelatin containing fine silver bromide. When the light with different intensity shines on the film during photography, it will cause AgBr decomposition products on the film to varying degrees. Bromine and silver gelatin become extremely fine Silver nucleus On the precipitation film, the more sensitive AgBr decomposes, the darker the part will be. In addition, silver bromide and Silver iodide Similarly, it can also be used for artificial rainfall Colloidal material 。 
