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Red Cabbage pH Testing
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Red Cabbage pH Testing
🧪 Part 1: Understanding pH
1. What does pH measure?
How hot or cold something is
How acidic or alkaline something is
How much something weighs
How sweet something tastes
2. When red cabbage juice turns pink or red, this means the liquid is:
Acidic
Neutral
Alkaline (basic)
Dangerous
3. Which colour indicates a neutral substance when using cabbage juice?
Pink
Purple
Green
Yellow
4. Which of these household items would you expect to be acidic? (Tick all that apply)
Lemon juice
Vinegar
Washing-up liquid
Orange juice
📊 Part 2: Recording Your Results
5. Complete the table below with your experimental results:
| Liquid Tested | Colour with Cabbage Juice | Acid, Neutral, or Alkaline? |
|---|---|---|
| Lemon juice | _____________ | _____________ |
| Water | _____________ | _____________ |
| Washing-up liquid | _____________ | _____________ |
| Milk | _____________ | _____________ |
6. Which liquid produced the most surprising result? Explain why.
7. Why is red cabbage juice a good natural indicator?
🌱 Part 3: Real-World Applications
8. Explain why gardeners might want to test the pH of soil.
9. Name two other situations where knowing the pH of something would be important:
1. ________________________________________________
2. ________________________________________________
10. If you wanted to test whether your local pond water was acidic or alkaline, what would you need to do?
11. Design a simple investigation to test which brand of washing-up liquid is most alkaline. What would you need and what steps would you follow?
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