Question

define acid base indicator give two examples and their colour change

Answer 1

An acid-base indicator is either a weak acid or weak base that exhibits a color change as the concentration of hydrogen (H+) or hydroxide (OH-) ions changes in an aqueous solution. Acid-base indicators are most often used in a titration to identify the endpoint of an acid-base reaction. They are also used to gauge pH values and for interesting color-change science demonstrations.


Perhaps the best known pH indicator is litmus. Thymol Blue, Phenol Red and Methyl Orange are all common acid-base indicators. Red cabbage can also be used as an acid-base indicator.

Answer 2

an indicator is a substance that shows different colours in different mediums.
one such common indicator is litmus.it is obtained from lichen and is purple in colour
the other indicators  and their colour change are
1.turmeric : yelow in acid and red in base
2.china rose: pink/red in acid and dark green in base
3.phenopthalin: colourless in acid ,pink in basic
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