Chemistry students in an undergraduate teaching laboratory using digital pH meters to measure the pH of chemical solutions, whilst being supervised by a postgraduate student, often called a demonstrator, who is wearing a blue lab coat. The tip of the pH probe is immersed in to the liquid and measurements are taken to determine its pH. A pH reading below 7 is acidic, one above 7 is alkaline, while a pH of 7 is neutral. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / SCIENTIFIC PICTURE RESEARCH |
Bildgröße: | 5170 px × 3446 px |
Modell-Rechte: | vorhanden |
Eigentums-Rechte: | vorhanden |
Restrictions: | - |