One Line Answer
What is an indicator? Name three common indicators.
What is an indicator?
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Solution 1
Indicators are substances that show a distinct change (colour or odour) simultaneous to a change in concentration of ions such as H+ and OH- ions.
Examples: Methyl orange, phenolphthalein and litmus solution.
Solution 2
An indicator or acid-base indicator is a chemical substance which indicates the acidic or basic nature of a solution by suitable colour change.
Concept: Indicators
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