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: 1,4,7,10,13. 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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Andrew Lambert Photography |
Bildgröße: | 4866 px × 3607 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |