How can natural indicators be prepared? Explain by giving an exam… - Vidyadip

Question

How can natural indicators be prepared? Explain by giving an example.

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Answer

Natural indicators can be made using plant materials with pigments that change colour with acid or base. For example, to make red rose extract :
1. Wash and crush rose petals.
2. Place them in a glass tumbler and add hot water.
3. 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.

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