Question

Describe the tests used to determine acids and bases.

Answer 1

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

1. Test with a litmus paper: An acid turns blue litmus paper into the red. A base turns red litmus paper into the blue.
2. Test with an indicator Phenolphthalein: In an acid medium, phenolphthalein is colourless. In the basic medium, phenolphthalein is pink in colour.
3. Test with an indicator Methyl orange: In an acid medium, methyl orange is pink in colour. In the basic medium, methyl orange is yellow in colour.