Universal indicator papers. This paper is used to measure the strength of an acid or an alkali. When the paper is dipped into a solution,it changes colour depending on the solution's pH. The pale green paper is neutral (pH 7),whereas the orange and red papers are increasingly acidic (approximately pH 4 and pH 2 respectively). The dark green and violet papers are increasingly alkaline,or basic,(approximately pH 8-9 and pH 11 respectively). pH is a logarithmic measure of hydrogen ion concentration. Acid solutions have a high concentration of hydrogen ions,while alkali solutions have a low concentration of hydrogen ions | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Gustoimages |
Taille de l’image : | 4000 px × 5549 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |