Testing pH. Universal indicator (left) being used to test the pH of a solution (centre) of sodium hydroxide (right). As sodium hydroxide is an alkali,the indicator is purple | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Trevor Clifford Photography |
Bildgröße: | 3970 px × 2657 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |