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. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Chillmaid, Martyn F. |
Taille de l’image : | 4161 px × 4200 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |