1. Acid Rain

2. Educational Objectives To understand how the pH level of an environment affects living organisms. To understand the relationship between the pH level and CO 2 concentration of distilled water.

3. What is Acid Rain Formed when gases, such as CO 2 and SO 2 react with the water in the atmosphere The pH of Rain drops –As low as pH of 2 –Very harmful to our living environment

4. Examples When CO 2 reacts with water, carbonic acid is formed. CO 2 (g)+H 2 O(l)-  H 2 CO 3 (aq) When SO 2 reacts with water, sulfurous acid is formed. SO 2 (g)+H 2 O(l)-  H 2 SO 3 (aq) When NO 2 reacts with water, nitric acid is formed. 2NO 2 (g)+H 2 O(l)-  HNO 2 (aq)+HNO 3 (aq)

5. How does Acid Rain effect us It kills micro-organisms It poisons plants It damages metals and limestone It kills fish

6. Procedures Record the pH of distilled water by using the pH probe for 1 minute Rinse the probe, and put it back into the buffer solution Record the pH of the same water as you blow into the water for 1 minute

7. Questions Why do we blow ‘air’ into the water? What are we really mixing the water with? What changes in pH do you expect? Is this a good simulation to the Acid Rain formation? Explain.