Acidic Rain
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ACID RAIN
Acid rain is generally considered any precipitation with a pH value lower than 5.6. Normal rain has a value of 5.6. It is slightly acidic due to the presence of carbonic acid formed by the mixture of carbon dioxide and rainwater. Ironically, 5.6 is the pH value of carbon dioxide in equilibrium with distilled water. The pH scale is based on a scale of one to seven, one being the most acidic and seven being the most basic. The pH scale is logarithmic, which means that a pH of six is ten times more acidic than a pH of seven.
Acid rain is caused when elevated levels of sulfur dioxide (SO2) and nitrogen (IV) oxide (NO2) are discharged into the atmosphere...