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← 2.2 Acids, Bases and Indicators

Bases: ash, soap and lime

Integrated Science · Grade 7 · about 40 minutes

Soap, jiko ash, toothpaste and lime are the working bases. They clean, treat soil and can irritate skin if strong.

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  • 6 sections of explanation, worked examples and diagrams
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Other lessons in this sub-strand

  1. Why acids and bases matter
  2. What acids are
  3. What bases are
  4. Acids in the Kenyan kitchen
  5. Bases: ash, soap and lime
  6. How to use litmus paper
  7. Identifying acids with litmus
  8. Identifying bases with litmus
  9. Neither acid nor base
  10. Plant indicators
  11. Preparing a plant indicator
  12. Classifying with a plant indicator
  13. Universal indicator and pH
  14. Physical properties of acids
  15. Physical properties of bases
  16. Investigating properties together
  17. Acids fizz with baking soda
  18. Uses of acids
  19. Uses of bases
  20. Indicators and antacids
  21. Soil acidity and lime
  22. Waste, safety and appreciation