Health and disease > indicator

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

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.