● Rain is naturally acidic because of dissolved CO2 and has a pH of 5.6. Acid deposition has a pH
below 5.6.
● Acid deposition is formed when nitrogen or sulfur oxides dissolve in water to form HNO3, HNO2,
H2SO4, and H2SO3.
● Sources of the oxides of sulfur and nitrogen and the effects of acid deposition should be covered.

● Balancing the equations that describe the combustion of sulfur and nitrogen to their oxides and the subsequent formation of H2SO3, H2SO4, HNO2, and HNO3.
● Distinction between the pre-combustion and post-combustion methods of reducing sulfur oxide emissions.
● Deduction of acid deposition equations for acid deposition with reactive metals and carbonates.