Please do note, however, that some methods and kits may include chemicals that may be harmful to students, so please plan safety precautions accordingly. Explain to students the meaning of pH and how it relates to acids and bases. Tell students that the pH level of substances can have dramatic effects on the environment and ecosystems. It has been shown that as acid levels rise in lake water, fish population decreases. Soil and water that is too acidic can be harmful to plant life.
Acid rain can contribute to high acid levels in water and soil.
Explain to students that in this activity, they will learn to measure and compare the pH level of various soil samples. Make sure not to collect the samples from a known refuse-dumping area, etc. Note where each sample comes from. Fill a styrofoam cup one-quarter full with the soil. Label each cup with the location and any other appropriate information.