Blackcurrant juice indicator in an alkali solution (image 2 of 2). Changes in colour (here from purple,the original colour of the juice,to green) are a common way to test the pH of a solution. Alkali and acid are the two parts of the pH scale,indicating the hydrogen ion concentration in a solution relative to that found in water. Alkalis (pH 8-14) contain fewer free hydrogen ions than water,while acids (pH 1-6) contain more. Water (pH 7) is considered neutral. See A500/520 for blackcurrant juice in an acidic solution | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Andrew Lambert Photography |
Bildgröße: | 3714 px × 4832 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |