Something colourful with kitchen items that can be used to show how acidic (or basic) something is.
What you need:
- red cabbage
- water
- blender
- food or chemicals to test for acidity, eg. lemon juice, vinegar, shampoo, household cleaner, tomato, egg white
What to do:
- Put three or four red cabbage leaves into a blender. Fill it to half way with water and blend.
- Strain the cabbage solution, collecting the liquid.
- Put the liquid into glasses.
- Add a few drops of whatever you want to test for acidity. Vinegar, baking soda and lemon juice are good ones to test.
What happens:
An indicator is a liquid that will tell you if something is an acid or a base. When something acidic is put in red cabbage indicator, it turns pink. When something is a base, it turns green or blue. pH is the measure of how acidic something is. Anything that is less than 7.0 is an acid, anything that is greater than 7.0 is a base. 7.0 is called neutral.
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