Question

Give a list of natural and synthetic indicator

Answer 1

Special types of substances are used to test whether a substance is acidic or basic the substances are known and indicators indicators are substances which show change in colour when brought in contact with acids and bases.

NATURAL INDICATORS :
1.TURMERIC -
Turmeric is yellow in neutral solutions.
Turmeric is yellow acidic solutions.
Turmeric  is red in basic solutions.

2.CHINA ROSE PETALS :
China rose indicator is pink in neutral solutions.
China rose indicator is dark pink in acidic solutions.
China rose is green in basic solutions.

3.LITMUS :
It is a commonly used indicator. When added to an acidic solution it turns red and when added to basic solution it turns blue.

4.RED CABBAGE JUICE : Red cabbage juice turns blue in a basic solution but it shows a distinct red colour in an acidic solution. 

SYNTHETIC INDICATORS :
1.PHENOLPHTHALEIN :Its original colour is colourless. Phenolphthalein is colourless in acidic medium and pink in basic medium.

2.METHYL ORANGE : Its original colour is orange. Methyl orange is red in acidic medium and yellow in basic medium.
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