The reaction of the “silver mirror”.
| March 15, 2021 | education
The silver mirror reaction is the reaction of reducing silver from an ammoniacal solution of silver oxide.
In an aqueous solution of ammonia, silver oxide dissolves to form a complex compound – diammine silver (I) hydroxide [Ag (NH3) 2] OH.
Ag2O + 4NH3 * H2O = 2 [Ag (NH3) 2] OH + 3H2O.
When added to which an aldehyde occurs a redox reaction with the formation of metallic silver.
If the reaction is carried out in a vessel with clean and smooth walls, then the silver falls out in the form of a thin film, forming a mirror-like surface. In the presence of the slightest contamination, silver is released in the form of a gray loose sediment.
The silver mirror reaction can be used as a qualitative reaction to aldehydes.
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