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Analysing Alcohols(12/03/2016) Aim: To outline an experiment to determine whether an unknown liquid is a primary secondary or tertiary alcohol. Equations Primary alcohol+excess oxygen CH3CH2OH+[O] Aldehyde CH3COH +H2O Secondary alcohol+excess oxygen CH3CHOHCH3+[O] keytone CH3COCH3+H2O Aldehyde carboxylic acid CH3COH +[O] CH3COOH Equipment 250cm beaker Bunsen burner Tri-pod Gauze 4xtestubes Method 1. Half fill a 250cm beaker with water 2. Heat it over a Bunsen burner. 3. Put 10cm of the alcohol in a test tube and add 1cm3 of potassium dichromate then add 5cm of sulphuric acid. 4. Label the test tubes and place them in the water bath 5. Check for colour changes and if the colour of the unknown liquid goes green then it is a secondary or primary alcohol. However if the colour remains orange it is a tertiary alcohol If it is primary or secondary alcohol 6. You then put another fresh 10cm of the unknown alcohol in a new test tube and add Tollens’ reagent to it 7. put the test tube in the water bath and wait for 5mins 8.keytones(originating from a secondary alcohol) will have no colour change while aldeyhdes (originating from a primary alcohol) will produce a grey precipitate Risk Assessment Sources http://www.chemguide.co.uk/organicprops/carbonyls/oxidation.html12/03/2016