Testing pH with universal indicator paper. To check the pH of a solution of acidified iron (II) sulfate a strip of universal indicator paper is clipped from the roll. When the orange paper changes colour it can be checked against a chart to discover the acidity or alkalinity of a liquid. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Chillmaid, Martyn F. |
Bildgröße: | 4161 px × 4200 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |