Monday, January 28, 2013

Acid Rain Definition

               Acid rain is a form of precipitation usually acidic in nature. That means it contain low pH value. [ liquid with pH less than 7 are acidic . pH grater than 7 are alkaline ]. So the unpolluted rain has acidic pH.     ( low pH ). Acid rain is caused by the emission of sulfur dioxide and nitrogen oxide. These two oxides react with water molecules in the atmosphere to produce acids. [ Sulfuric acid & Nitric acid ].

  • In the presence of water sulfur trioxide is converted to sulfuric acid.
  • Nitrogen dioxide react with OH to form nitric acid.
Sulfur trioxide  and nitrogen dioxides are released from power plants and other sources. Nitrogen oxide naturally produced by lightning strikes. Sulfur dioxide is naturally produced by volcanic eruption. In areas where is wet acid rain can fall to earth in the form of rain, snow, fog, and cloud water. Where the weather is dry it is in the form of gases ( smoke ) and acidifying particles ( dust ).

        Acid rain can damage the environment . Human health and property. Acid rain can causes paint to peel, corrosion of steel ( iron , copper ) structure. Erosion of stone statues ( limestone & marble ).     

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