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Silver Mirror Test

OCR A-level Organic ChemistryCarbonyl CompoundsLesson 5 of 12

The silver mirror test is used as a test for aldehydes. Tollen's reagent is ammoniacal silver nitrate (silver nitrate in ammonia solution) and is used as a weak oxidising agent to oxidise aldehydes to carboxylic acids. Ketones cannot be further oxidised so Tollen's reagent can be used to distinguish between aldehydes and ketones.

Diagram

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Key terms in this lesson

oxidising agent
A substance that oxidises another species, for example by removing electrons or by adding oxygen or removing hydrogen, while itself being reduced.

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