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Resource Book for Sixth-Form Practical Chemistry

Experiment 10

Alcohol Breath Analyzer

image: Silica gel Silica gel
image: Mixture of K2Cr2O7 solution and sulphuric acid with silica gel Mixture of 0.1 M K2Cr2O7 solution and 6 M sulphuric acid with silica gel
image: Mixture on a Petri dish – Before drying Mixture of 0.1 M K2Cr2O7 solution and 6 M sulphuric acid with silica gel on a Petri dish – Before drying
image: Mixture on a Petri dish – After drying in a fumehood for overnight Mixture of 0.1 M K2Cr2O7 solution and 6 M sulphuric acid with silica gel on a Petri dish – After drying in a fumehood for overnight
image: A small piece of glass wool was inserted into a dropper A small piece of glass wool was inserted into a dropper
image: Using the separatory funnel to separate aspirin and caffeine The dried silica gel with acidified K2Cr2O7 was packed into the dropper
image: Adaptor for connecting the filled balloon to the dropper Adaptor for connecting the filled balloon to the dropper
image: Sample result - Beer. Sample result: Beer.

Part of the orange acidified dichromate(VI) ions on silica gel changed into blue chromium(III) ions
close-up image: Part of the orange acidified dichromate(VI) ions on silica gel changed into blue chromium(III) ions
image: Sample result - Red wine. Sample result: Red wine.
close-up image: two third of the orange acidified dichromate(VI) ions on silica gel changed into blue chromium(III) ions
image: Sample result: 95% Ethanol. Sample result: 95% Ethanol.
close-up image: all of the orange acidified dichromate(VI) ions on silica gel changed into blue chromium(III) ions
image: Test-tube experiment - Acidified potassium dichromate(VI) solution in a test-tube Test-tube experiment: Acidified potassium dichromate(VI) solution in a test-tube
image: Test-tube experiment - A few drops of ethanol were added to the acidified potassium dichromate(VI) solution Test-tube experiment: A few drops of ethanol were added to the acidified potassium dichromate(VI) solution

2004 Department of Chemistry, The Chinese University of Hong Kong