Indicators are substances that change colour when they are added to acidic or alkaline solutions. Universal indicator is the indicator most commonly used in the laboratory. If universal indicator ...

Repeat step 1 with ethanoic acid into a separate test-tube. Add 5 drops of Universal Indicator to each test-tube and record the pH, or use a pH meter to record the pH. You should find that ...

These new universal indicators offer precision ... With the demo mode feature one can test the indicator's performance and functionality prior to installation. In addition, there are no buttons ...