Write any three indicators and how they change in acidic medium? [3 MARKS]
Each point: 1 Mark
Indicator Change in acidic medium
1. Blue litmus paper Blue to Red
2. Methyl orange Orange to pink
3. Phenolphthalein Remains colourless
Write any three physical properties of bases? With effect on 3 indicators. [5 MARKS]
Why do visual indicators show a change in colour when introduced to an acidic and basic medium?