What is an indicator? Name three common indicators. (b) Name the acid-base indicator extracted from lichen. What colour does the turmeric paper turn when put in an alkaline solution?
ChemistryClass 10ICSEAnswered 27 Mar 2026
Answer
- An indicator is a dye that shows a distinct change in colour when put in acid or base or as the ion concentration changes. Litmus, Methyl orange and phenolphthalein are the examples for indicators.
- Litmus is the acid-base indicator extracted from It will show colour change blue to red when in acid and red to blue in base
- When turmeric paper is dipped in alkaline solution it will turn to