Universal indicator in alkali

Numéro d’image : 11520056
Universal indicator in alkali
Universal indictor in alkali. The colour of the solution is being compared to a chart on the bottle of indicator,showing that it has pH 14. Universal indicator (UI) is a mixture of chemicals that changes colour depending on the pH (acidity) of its environment. The pH scale runs from 1 (strong acid) through 7 (neutral,such as water) to 14 (strong alkali). In strong acids it is red,turning orange then yellow as the pH increases. In water it is yellow/green,and it turns blue then purple in successively stronger alkalis. See images A500/487 and A500/488 for a acidic and neutral solution respectively
Licence : Droits gérés
Crédit: Science Photo Library / Andrew Lambert Photography
Taille de l’image : 3631 px × 4857 px
Model Release : Non requis
Property Release : Non requis
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