Universal indictor in alkali. The colour of the solution is being compared to a chart on the bottle of indicator,showing that it has pH 14. Universal indicator (UI) is a mixture of chemicals that changes colour depending on the pH (acidity) of its environment. The pH scale runs from 1 (strong acid) through 7 (neutral,such as water) to 14 (strong alkali). In strong acids it is red,turning orange then yellow as the pH increases. In water it is yellow/green,and it turns blue then purple in successively stronger alkalis. See images A500/487 and A500/488 for a acidic and neutral solution respectively | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Andrew Lambert Photography |
Bildgröße: | 3631 px × 4857 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |