Plant Acid-base Indicator
by Andrew Lambert Photography/science Photo Library
Title
Plant Acid-base Indicator
Artist
Andrew Lambert Photography/science Photo Library
Medium
Photograph - Photograph
Description
Plant acid-base indicator. Red cabbage 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 lower than 7 (red and pink) at left, pH7 (purple) at lower centre, and pH higher than 7 9green and yellow) at right. 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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October 4th, 2018
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