CBSE Class 7 Science
Question 16 of 19
Exploring Substances Acidic Basic and Neutral — Question 16
Back to all questions 16
Question How can natural indicators be prepared? Explain by giving an example.
Natural indicators can be made using plant materials with pigments that change colour with acid or base. For example, to make red rose extract:
Wash and crush rose petals.
Place them in a glass tumbler and add hot water.
Let it sit for 5-10 minutes, then filter the mixture.
The resulting liquid is a natural indicator that turns red in acids and green in bases.