Testing toothpaste for alkalinity. Litmus indicator changes its colour depending on the pH. Here a litmus indicator paper strip has changed colour from red to blue after coming in contact with toothpaste that contains sodium bicarbonate (NaHCO3). The test shows that the toothpaste is alkaline. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Turtle Rock Scientific |
Taille de l’image : | 5166 px × 3438 px |
Model Release : | Non requis |
Restrictions : |
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