Edexcel IGCSE Chemistry · Spec 2.28-2.32
Acids, Alkalis, Indicators & the pH Scale
Acids and alkalis, indicators, and the pH scale.
Chemistry revision video
Acids, Alkalis, Indicators & the pH Scale
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Spec 2.28-2.32
What you need to know
- Use the pH scale to classify solutions
- Describe indicators and their colours
- Explain neutralisation
Active recall
Quick check
Answer each question before opening the answer.
What pH values are acidic, neutral and alkaline?
Below 7 is acidic, 7 is neutral, and above 7 is alkaline.
Which ion do acids and alkalis produce in water?
Acids produce H+ ions; alkalis produce OH− ions.
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