Overview

Tollens reagent


'Tollens reagent' can also refer to...

 

More Like This

Show all results sharing these subjects:

  • Chemistry
  • Biological Sciences

GO

Show Summary Details

Quick Reference

A reagent used in testing for aldehydes, named after German chemist B. C. G. Tollens (1841–1918). It is made by adding sodium hydroxide to silver nitrate to give silver(I) oxide, which is dissolved in aqueous ammonia (giving the complex ion [Ag(NH3)2]+). The sample is warmed with the reagent in a test tube. Aldehydes reduce the complex Ag+ ion to metallic silver, forming a bright silver mirror on the inside of the tube (hence the name silver-mirror test). Ketones give a negative result.

Subjects: Chemistry — Biological Sciences.


Reference entries

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.