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Although both aldehydes and ketones contain the carbonyl functional group (-C=O), only aldehydes give a positive test (formation of an orange to brick-red precipitate of copper(I) oxide) with Fehling’..
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Although both aldehydes and ketones contain the carbonyl functional group (-C=O), only aldehydes (or reducing sugars) give a positive ‘silver mirror’ test result with Tollen’s reagent. This small-scal..
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Using a number of aldehydes safely in practical work. Includes ethanal (acetaldehyde), ethanal tetramer (metaldehyde), propanal (proprionaldehyde) and butanal (butyraldehyde).
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In this activity, a primary alcohol (ethanol) is oxidised to an aldehyde (ethanal) using an acidified dichromate(VI) solution. After collection by distillation, the organic product can be tested to co..
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Guidance on how to prepare (and use) of Fehling's solutions A and B.
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Risk assessment guidance for propanal, butanal and benzaldehyde.
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Guidance on how to prepare Sandell's solution. This reagent may be used to test for aldehydes and is a safer alternative to Fehling's for testing for reducing sugars.
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Guidance on how to prepare potassium dichromate(VI) and sodium dichromate(VI) solutions.
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Many 16+ curricula include testing for organic functional groups. Qualitative distinction of primary/secondary alcohols from tertiary alcohols, and aldehydes from ketones is commonly carried out with ..
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Brief risk assessment guidance and experimental notes for a range of practical activities involving silver nitrate(V) and its solutions (Hazcard 87).
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