This activity results in impressive color changes and is really fun to do! Students will use cabbage juice to test various substances for acidity or alkalinity. Purple cabbage juice turns bright pink for acids and bright blue for bases. This lab lists vinegar, tap water, baking soda solution, lemon/lime soda, and bleach solution - but you can easily convert the file to a word document and edit as needed.
This is a completely qualitative lab, and it is meant to be done in very little time. The activity is simple enough to be done with 5th graders, but great to do with high school kids, too.
Very easy to expand on, but great as a stand-alone lab.