If universal indicator is added to a solution it changes to a colour that shows the pH of the solution. Universal indicator is a mixture of a variety of other indicators and can be used to measure ...

Universal indicator is a wide range ... a wide range of colors at different pH values. To Conduct Demonstration: (approx. 5 min) Show the students that the HCl solution in the Erlenmeyer is colorless.

1. Dissolve 6.5g KOH (potassium hydroxide) in 1600mL water and add several drops of universal indicator. Place in 2000mL graduated cylinder.

Add 5 drops of universal indicator to each test-tube and record the pH or use a pH meter to record ... allow the reaction to proceed for 10 seconds and record your observations.