Red Cabbage pH Testing
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Red Cabbage pH Testing
Understand the colour clues
Cabbage indicator contains a pigment that changes colour depending on pH. The pH scale runs from 0 to 14: values below 7 are acidic, 7 is neutral, and values above 7 are alkaline. The colour can vary with concentration, so use it as a clue rather than an exact pH measurement.
Liquid type
Typical indicator colour
Acidic
Pink or red
Neutral
Purple
Alkaline
Blue or green
- How hot or cold it is
- How acidic or alkaline it is
- How much it weighs
- How quickly it evaporates
A class tests four liquids
A group added the same amount of cabbage indicator to equal-sized samples. They recorded these results. The results are illustrative; real colours can vary.
Sample liquid
Indicator colour
Approximate pH
Lemon juice
Pink
2
Water
Purple
7
Washing-up liquid
Blue-green
9
Vinegar
Red-pink
3
- Below 7
- Exactly 7
- Above 7
- Neutral
- Acidic
- Alkaline
3 printable pages
Page 1
Page 2
Page 3
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