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Unformatted text preview: When we burn coal we make: Ash Water Vapor Carbon Dioxide Sulfur Nitrogen Where does sulfur oxide come from? 1) Sulfur chemically combined with the coal itself 2) Some of the minerals in coal also contain Sulfur-When they transform into ash, they also make SOx -Sulfur goes into the boiler with the coal Where does NOx come from? 1) Nitrogen that is chemically combined with the coal 2) Nitrogen molecules in air react at high temperature in fireball in the boiler- Nitrogen chemically combined with coal fuels NOx-High temperature causes Thermal NOx SO WHAT?-SOx and NOx mix with oxygen in the air SOx + O2 + H2O = H2SO4 (sulfur acid) NOx + O2 + H2O = HNO3 (Nitra acid) Acidic precipitation Acid rain- Acidity is measured by the pH scale 1) pH values run from 0-14 2) pH=7 indicates solution is neutral 3) pH<7 the solution is acid. The smaller the number, the more acidic it is 4) pH>7 it is a basic (alkaline)-the larger the number, the more basic it is 5) The numbers differ by factor 10 Some CO2 occurs naturally in the environment CO2 also dissolves in water to make an acid: carbonic acid CO2+H2O=H2CO3-Natural rainfall in a totally unpolluted area has a pH of 5.7-Natural rainfall in a totally unpolluted area has a pH of 5....
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