- Pre-prepared purple cabbage juice (can be made at home the night before with a blender and a strainer.
- Cups or egg cartons to hold liquids
- Lemon juice
- Bleach- based cleaning product
- Selection of other foods (soda, baking soda, egg whites, tomato juice)
Students can experiment with adding cabbage juice different liquids to determine their pH. They can create a scale of the materials from most acidic to most basic.