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Use a volume of dilute hydrochloric acid that models the volume and concentration of our stomach contents. Add typical doses of a range of over-the-counter antacid preparations – powders, tablets and liquids. Monitor the changing pH with Universal indicator solution (or a pH probe). Compare the effects of different preparations and discuss the short and long-term consequences

This investigation follows the transfer of a harmless microorganism from an agar plate, via toilet paper to our hands. This models the transmission of faecal microbes after using the lavatory, and allows us to assess the efficacy of using toilet paper and of hand washing as part of our daily hygiene regime. You can use

Measure the vitamin C content of a sample of fruit juice by measuring the volume of the sample required to decolourise a solution of DCPIP. Calibrate the results by comparison with a known concentration of vitamin C.