AP Biology students conducted a pH indication experiment, using juice from red cabbages to test the pH of vinegar, lemon juice, baking soda solution, ammonia, and a sugar solution.

When the cabbage juice is added, these common household solutions change color based on how acidic or basic they are.

Students compared their results with actual pH test strips and wrote lab reports explaining any discrepancies, as well as the properties of red cabbage that allow it to function as a pH indicator.