Silver bromide

Cubic

White to yellowish- green solid

Fixed

6.47 g · cm -3

430 ° C.

1300 ° C.

Insoluble in water, 0.14 mg · l-1 (25 ° C)

-100.4 KJ / mol

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Silver bromide is a chemical compound of silver, one of the bromides. It is a chemical much used in photochemistry, which decays with the light.

Occurrence

Silver occurs in nature in the form of the mineral Bromargyrit.

Production and representation

Silver precipitates upon coincidence of silver salt, usually silver nitrate and a soluble bromide salt, as yellowish -white precipitate.

Properties

Silver is very insoluble in water, slightly soluble in concentrated ammonia solution difficult and in thiosulfate and cyanide. It turns dark quickly in the light due to silver deposition by the photolytic decomposition.

Use

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The salt is stored in small Kristallbröckchen in a gelatin layer (or similar substances ). If falls on this light, the silver bromide decomposed into its elementary components - silver and bromine; the bromine evaporates. The exposed crystals stand out from the background, since the finely divided silver appears black.