Universal indicator

A universal indicator is a test to measure the pH value of a liquid. The solution used contains several chemical indicators. The indicator is able to show different colors, and therefore pH value ranges. The drawback of this solution is that it cannot be used for titrations, which expect a well-defined change in color.
pH rangeDescriptionColour< 3Strong AcidRed3-6Weak AcidOrange/Yellow7NeutralGreen8-11Weak BaseBlue> 11Strong BaseViolet/Purple

Related pages

 Titration
Litmus paper

Category:Science
Category:Chemistry