Demonstration of the colours of blue litmus indicator in first alkali (right) and then acid (left). The compound is blue in solutions with a pH above 8.3 (alkaline), and red in solutions below pH 4.5 (acidic). | |
Licence : | Droits gérés |
Crédit : | Science Photo Library / RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA |
Model Release : | Non requis |
Durée : | 13 Secondes |
Aspect ratio : | 16/9 |
Restrictions : | - |