HSC Chemistry Experiment: Natural PH Indicator from Anthocyanin

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Published 2 May 2011
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For the HSC Chemistry syllabus dot-points: “Perform a first-hand investigation to prepare and test a natura...
For the HSC Chemistry syllabus dot-points: “Perform a first-hand investigation to prepare and test a natural indicator” and Solve problems by applying information about the colour changes of indicators to classify some household substances as acidic, neutral or basic”. 

We crushed some red cabbage immersed in ethanol to extract the anthocyanin. This purple solution was applied to several household solutions varying in pH and the range of colours were analysed according to the known acidity / basicity of the solutions tested.
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