Plant acid-base indicator

Plant acid-base indicator

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Credit: 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. pH is the measure of the amount of hydrogen ions in a solution, and is used to measure its alkalinity or acidity. 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.

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Keywords: acid, acid-base, acidic, acidity, alkali, alkaline, alkalinity, analysis, analytical, anthocyanin, apparatus, base, change, chemical, chemistry, colour, comparing, comparison, demonstrating, demonstration, equipment, experiment, experimental, glassware, indicator, juice, lab, laboratory, natural, neutral, ph, plant, range, reacting, reaction, red cabbage, test, testing, vegetable

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