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Acids and Alkalis

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A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science.

Acids and Alkalis (Bases)
The following table shows the colour change of the pH indicator for different types of substances.

pH indicator examples

Procedure:
1. Place a small amount of different solutions in separate tubes.
2. Label the test tubes to ensure you know which solution is present in each tube.
3. Add a few drops of universal indicator solution to each tube and note the pH.
4. List the solutions in order of increasing pH.

Acids taste sour.
Alkalis are bitter and slippery.



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