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Asked by 2806rahul 15th May 2010, 6:58 PM
Answered by Expert

Natural indicators are those which are derived from plants or animals.

Example: litmus, turmeric, onion etc.

  1. Onion: Smell of onion diminishes in a base and remains as it is in an acid.
  2. Turmeric: In acids, yellow colour of turmeric remains yellow. In bases, yellow colour of turmeric turns red.
  3. Litmus: Litmus is a natural indicator. Litmus solution is a purple dye which is extracted from lichen. Acids turn blue litmus red. Bases turn red litmus blue. Water is essential for acids and bases to change the colour of litmus paper. Remember that litmus paper will act as an indicator only if either the litmus paper is moist or the acid or base is in the form of aqueous solution. This is because acids and bases release H+ and OH- ions respectively in aqueous solutions.

Answered by Expert 19th May 2010, 11:59 AM
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