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Chapter: 9th Science : Acids, Bases and Salts

Tests for Acids and Bases

Take 10 ml of solution in a test tube and test with a litmus paper or indicators like phenolphthalein and methyl orange.

Tests for Acids and Bases

Take 10 ml of solution in a test tube and test with a litmus paper or indicators like phenolphthalein and methyl orange.

a) Test with a litmus paper:

An acid turns blue litmus paper into red.

A base turns red litmus paper into blue.

b) Test with an indicator Phenolphthalein:

In acid medium, phenolphthalein is colourless. In basic medium, phenolphthalein is pink in colour.


c) Test with an indicator Methyl orange:

In acid medium, methyl orange is pink in colour. In basic medium, methyl orange is yellow in colour.



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9th Science : Acids, Bases and Salts : Tests for Acids and Bases |


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