Why Lesson Planet?
Learners use litmus paper to begin to discover the qualities of acids and bases. They learn about pH by testing clear liquids for acidity with purple cabbage juice as an indicator. The video Streamkeeper, with Bill Nye, and other video resources (not included), along with observations of a potted plant watered with vinegar solution, illuminate the sources and effects of acid rain on the environment. Cross-curricular extensions and links to useful websites are included.