Why identifing between aldehyde and ketone by using agno3 and nh4oh?
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Tollens' reagent is an alkaline solution of ammoniacal silver nitrate and is used to test for aldehydes. Silver ions in the presence of hydroxide ions come out of solution as a brown precipitate of silver(I) oxide, Ag2O(s). This precipitate dissolves in aqueous ammonia, forming the diamminesilver(I) ion, [Ag(NH3)2]+. Ketones do not react with Tollens' reagent.
2Ag+ (aq) + 2OH- (aq) Ag2 O(s) + H2 O(l)
Ag2 O(s) + 4NH3 (aq) + H2 O(l) 2[Ag(NH3)2]+ (aq) + 2OH- (aq)
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