Acid test. A pH indicator changes the colour depending on the pH of the solution. Here a universal indicator paper strip has changed colour from yellow to red after it was put in contact with a freshly sliced lemon (citric and ascorbic acids) | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Giphotostock |
Taille de l’image : | 5131 px × 3419 px |
Model Release : | Non requis |
Restrictions : |
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