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