Universal indicator in a strong acid. Universal indicator is a mixture of chemicals that changes colour according to the pH (acidity) of the solution in which it is placed. It is red in strong acids,orange in weak acids,yellow/green in neutral water,and blue then purple in increasingly strong alkalis | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Chillmaid, Martyn F. |
Taille de l’image : | 2848 px × 4256 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |