Sample of a buffer solution (pH 7) being poured from a measuring cylinder into a beaker. The green colour is due to universal indicator. A buffer is a solution that resists changes to its pH. Typically it contains a weak acid and a salt of the acid, and the equilibrium between them adjusts when acid or alkali is added, maintaining a constant pH. | |
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 : | - |