Across
- 4. is a reaction between an acid and a base.
- 8. turn blue litmus paper into red colour
- 9. turn red litmus paper into blue colour
- 10. of magnesia is a basic substance that can neutralise the acid of the stomach.
Down
- 1. is a natural indicator which is obtained from lichen.
- 2. is used to treat acidic soil.
- 3. water is neutral in nature.
- 5. is found in many household products, such as window cleaners.
- 6. indicators the indicators that occur in nature.
- 7. are also called alkaline.