High Quality Content by WIKIPEDIA articles! Tollens' reagent is usually ammoniacal silver nitrate, but can also be other compounds, as long as there is an aqueous diamminesilver(I) complex. It was named after Bernhard Tollens.The diamminesilver(I) complex is an oxidizing agent, which is itself reduced to silver metal, which in a clean glass reaction vessel forms a "silver mirror": [Ag(NH3)2]+ (aq) + e? ? Ag (s) + 2 NH3 (aq) This feature is used as a test for aldehydes, which are oxidized to carboxylic acids. It should be noted that the actual oxidation product is the carboxylate ion, which on acidification gives the corresponding carboxylic acid. Once it has been identified that there is a carbonyl group on the organic molecule using 2,4-dinitrophenylhydrazine (also known as Brady's reagent or 2,4-DNPH), Tollens' reagent can be used to ascertain whether the compound is a ketone or an aldehyde. Importantly, there is a special case in which Tollens' Reagent will give a positive for a ketone. If the ketone is an alpha-hydroxy ketone, then the Tollens' reagent will react.

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