When universal indicator is added to a solution, the color change can indicate the approximate pH of the solution. Acids cause universal indicator solution to change from green toward red. Bases cause ...

Make the indicator solution for student groups: Prepare a dilute universal indicator solution by combining 325 mL of water with 25 mL of universal indicator solution. This quantity should be enough ...

Universal indicator is a mixture of a variety of other indicators and can be used to measure the approximate pH of a solution. A more accurate value can be obtained using a pH probe. Figure caption, ...

Universal indicator has many different colour changes, from red for strongly acidic solutions to dark purple for strongly alkaline solutions. In the middle, neutral pH 7 is indicated by green.