Silver bromide

Silver bromide is a chemical compound. Its chemical formula is AgBr. It contains silver in its +1 oxidation state. It also contains bromide ions.

Properties

It is a light yellow solid. It does not dissolve in water. It darkens when light shines on it. The darkening is because it turns into silver metal and bromine gas. It reacts with ammonia to dissolve.

Preparation

It is made by reacting a bromide such as potassium bromide or sodium bromide with silver nitrate.

Uses

It is used in photographic film. The compound reacts with light (photolysis) to make particles of silver metal and release elemental bromine. These particles, called the latent image, react with a photographic developer to make larger particles that are visible to the eye. After this reaction, these silver particles make the dark parts of a film negative.

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↑ Gurney, R. W.; Mott, N. F. (1995). "The Theory of the Photolysis of Silver Bromide and the Photographic Latent Image". Sir Nevill Mott – 65 Years in Physics. World Scientific Series in 20th Century Physics. Vol. 12. pp. 111–128. doi:10.1142/9789812794086_0010. ISBN 978-981-02-2237-6.

[1] Gurney, R. W.; Mott, N. F. (1995). "The Theory of the Photolysis of Silver Bromide and the Photographic Latent Image". Sir Nevill Mott – 65 Years in Physics. World Scientific Series in 20th Century Physics. Vol. 12. pp. 111–128. doi:10.1142/9789812794086_0010. ISBN 978-981-02-2237-6.