When an aldehyde is heated with freshly prepared Tollen's reagent i.e. [Ag(NH3)2]+, a bright silver mirror of Ag is formed. AgNO3+NaOH⟶AgOH+NaNO3 2AgOH⟶Ag2O+H2O Ag2O+4NH3+H2O⟶
2Ag(NH3)2+
Tollen's reagent
+2OH− Reaction of aldehyde with Tollen's reagent take place as follows