Question

(a) Name one indicator which turns red on adding an acid.
(b) Name one indicator which turns red on adding a base.

Answer 1

Answer:

(a) Blue litmus paper ,methyl orange

(b) turmeric,.

Answer 2

The indicator (a) is Blue litmus paper and the indicator (b) is turmeric.

Explanation:

1. The indicator which turns red on adding and acid is blue litmus paper.

2. The indicator which turns red on adding a base is turmeric.

3. Indicator is a substance or a compound made of chemicals which changes its color when comes in contact with an acid or a base.

4. Indicator may obtained naturally or even artificially. It can also be obtained from the pigments of plants.

5. Another common indicator is phenolphthalein. This when added to an acidic solution, the solution becomes colourless. And when added to a solution containing base, the solution turns into pink color. This way we can detect which is acidic and basic.

6. Another indicator, that is, methyl orange changes to red in presence of acid and becomes yellow in solution that is alkaline.

LEARN MORE:

Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions respectively are:

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Why does a moist blue Litmus Paper turns red when it is brought near the mouth of the test tube in which ferrous sulphate crystal are being heated?

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