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

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

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

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 them with water.
2. Crush the petals using a mortar and pestle.
3. Place them in a glass tumbler and add hot water.
4. Let it sit for 5-10 minutes, then filter the mixture.
5. The resulting liquid is a natural indicator that turns red in acids and green in bases.