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Plant acid-base indicator

Plant acid-base indicator

A500/0431

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Credit

ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY

Caption

Plant acid-base indicator. Red cabbage (lower centre) contains a natural acid-base indicator and shows a range of pH by the colour changes seen. Bases form alkaline solutions. The colour range here shows pH, from left to right: 1 (red), 4 (pink), 7 (purple), 10 (green), 13 (yellow). Acids have a pH less than 7. Alkalis have a pH greater than 7. Neutral solutions are pH 7. Each step of the pH scale marks a ten-fold change in acidity/alkalinity. The chemical in red cabbage that changes colour is an anthocyanin. The loss or gain of hydrogen ions changes its colour.

Release details

Model release not required. Property release not required.

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