The soap test

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

• 9 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

Other lessons in this sub-strand

1. The physical properties of water
2. Water from different sources
3. The soap test
4. Hard and soft water
5. What causes hardness
6. Temporary and permanent hardness
7. Softening by boiling
8. Softening with washing soda
9. Softening by distillation
10. Comparing the softening methods
11. Advantages of hard water
12. Disadvantages of hard water
13. Advantages and disadvantages of soft water
14. Choosing the right water for the job