Plant acid-base indicator

Numéro d’image : 11672595
Plant acid-base indicator
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 at left,pH7 at upper centre,and pH higher than 7 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
Licence : Droits gérés
Crédit: Science Photo Library / Andrew Lambert Photography
Taille de l’image : 4772 px × 3756 px
Model Release : Non requis
Property Release : Non requis
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