Back Tollens se reagens Afrikaans كاشف تولنز Arabic Reactiu de Tollens Catalan Tollensovo činidlo Czech Tollens' reagens Danish Αντιδραστήριο Τόλενς Greek Reactivo de Tollens Spanish واکنشگر تولنس Persian Réaction de Tollens French Tollensov reagens Croatian
-3D-balls.png)
Tollens' reagent (chemical formula ) is a chemical reagent used to distinguish between aldehydes and ketones along with some alpha-hydroxy ketones which can tautomerize into aldehydes. The reagent consists of a solution of silver nitrate, ammonium hydroxide and some sodium hydroxide (to maintain a basic pH of the reagent solution). It was named after its discoverer, the German chemist Bernhard Tollens.[1] A positive test with Tollens' reagent is indicated by the precipitation of elemental silver, often producing a characteristic "silver mirror" on the inner surface of the reaction vessel.
- ^ Tollens, B. (1882). "Ueber ammon-alkalische Silberlösung als Reagens auf Aldehyd" [On an ammonical alkaline silver solution as a reagent for aldehydes] (PDF). Berichte der Deutschen Chemischen Gesellschaft (in German). 15 (2): 1635–1639. doi:10.1002/cber.18820150243.