What is it
Students learn to use the pH scale and indicators to classify substances as acidic, neutral or alkaline, and understand neutralisation reactions between acids and alkalis, including simple examples like antacid tablets.
Why it matters
The pH scale and neutralisation reactions appear constantly in real life — from soil chemistry to digestion to industry — and are developed further with word and symbol equations at GCSE.
Exam tip
Memorise the pH scale direction (below 7 acidic, 7 neutral, above 7 alkaline) and at least one colour change for universal indicator — scale-reading questions are very common.
Related topics
Want help mastering Acids and Alkalis?
Tell us about the student's goals and confidence — we'll design a personalised plan.