I have designed a lab that is great for K-3 students, but could be used all the way up to middle level.
In the lab students test various samples to determine the color change of cabbage juice indicator. They use crayons to record the colors in a table.
The base line items to test are: lemon juice, vinegar, water, baking soda, washing soda, and drain cleaner. Note: some of the substances in the baseline pH spectrum are caustic. You may consider doing the baseline table as a demo, and have stu