S3.6.8 For the adult
Neutralisation
Why does a chalky tablet ease a sore stomach, and why do farmers spread white powder on soil?
What this chapter teaches
Neutralisation is an acid and an alkali cancelling each other out to make a salt and water. An antacid is a weak alkali that cancels some extra stomach acid. Lime is an alkali that raises the pH of sour soil. Too much alkali leaves an alkali, so the right amount matters.
Three questions to ask
There is no one right wording. Listen for the idea.
- What do an acid and an alkali make when they react?
- Why does an antacid help with indigestion?
- Why would a farmer test the soil before adding lime?
After the chapter, the learner can
- Explain neutralisation as an acid and an alkali cancelling out
- Explain how an antacid eases indigestion
- Explain why farmers add lime to sour soil
What they copy into their notebook
Acid + alkali → salt + water. This is neutralisation. An antacid eases stomach acid. Lime raises the pH of sour soil. Too much alkali leaves an alkali.