Organic Chemistry Practicals (A Level only) (AQA A-Level Chemistry): Flashcards

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Testing Aldehydes & Ketones
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Product when aldehydes are oxidised

Carboxylic acids

Can ketones be oxidised by weak oxidising agents?

No

Complex ion in Tollens' reagent

[Ag(NH3)2]+[Ag(NH_3)_2]^+ (silver(I) complex ion)

Positive test result for aldehydes (Tollens' reagent)

Silver mirror forms

What happens to Ag+Ag^+ ions when aldehyde reacts with Tollens' reagent?

Reduced to solid metallic silver Ag(s)Ag(s)

Test result for ketones with Tollens' reagent

No reaction, no silver mirror

Precipitate formed: NaOHNaOH + AgNO3AgNO_3

Brown precipitate of silver(I) oxide

Effect of conc. ammonia on brown precipitate

Dissolves it completely

Hazard of dried Tollens' reagent

Forms explosive silver compounds

Testing procedure with Tollens' reagent

Add sample drops, gently warm in water bath

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