CBEHub

← 2.2 Acids, Bases and Indicators

How to use litmus paper

Integrated Science · Grade 7 · about 40 minutes

Litmus is an indicator. Blue paper goes red in acid. Red paper goes blue in a base. Use a drop; do not soak the booklet.

Sign in to read this lesson

Lessons are for learners and teachers with an account. Browsing the curriculum — subjects, strands and what each sub-strand covers — stays open to everyone.

  • 8 sections of explanation, worked examples and diagrams
  • 1 practice task with hints and worked answers
  • A quiz that marks itself as you go
  • Your progress kept across every subject you take
Sign in Create an account

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