1. Hydrosphere Acid Rain

2. Hydrologic Cycle

3. Sulfur Cycle

4. Long term, volume weighted averages of pH in precipitation – Europe 1978-1982

5. Northeastern U.S. 1980-1984

6. Lake Water pH vs. SO 2 Emissions

7. POP QUIZ The fish have been dying off in a lake down wind of a coal fired power plant. Based on the following information, calculate the pH of rain that is in equilibrium with SO 2 (g) emitted from the power plant. Is the pH of the rain less than you would expect. Explain. [SO 2 ] = 100 ppbv At 25 o C K h for SO 2 = 1.0 mol/(L atm) At 25 o C, K a for H 2 SO 3 = 1.7 x 10 -2

8. End