Acid rain was first described by an English man in 1872. He was a chemist and was first to note that rain that fell had a high percentage of acidity which effected man, animal and plants. It is now the most controversial form of air pollution in the developed world.
Acid rain is a form of pollution which became a serious environmental problem in the large urban and industrial areas of North America, Europe and Asia. Any precipitation that contains a heavy concentration of Sulphuric Acid (H2SO4) and Nitric Acid (HNO3) is generally called acid rain. Automobile industries, electrical power plants and some other industrial operations that burn fossil fuels and emit the gases like sulphur dioxide (SO2) and nitrogen oxide (NO2) into the environment. In the air the gases meet with water vapour available in clouds to reform Sulphuric Acid and Nitric Acid. This acid rain or highly acidic precipitation from those clouds may contaminate lakes and streams, thereby, harming the fishes and other aquatic species. It also causes a great harm to vegetation including agricultural crops and plants and trees. Now-a-days acid rain or acid precipitation has become a threatening problem for the environment and humankind.
|Acid rain is rain that has been made acidic by certain pollutants in the air. Acid rain is a type of acid deposition,
which can appear in many forms. Wet deposition is rain, sleet, snow, or
fog that has become more acidic than normal. Dry deposition is another
form of acid deposition, and this is when gases and dust particles
become acidic. Both wet and dry deposition can be carried by the wind,
sometimes for very long distances. Acid deposition in wet and dry forms
falls on buildings, cars, and trees and can make lakes acidic. Acid
deposition in dry form can be inhaled by people and can cause health
problems in some people. |
What is acidity?
Acidic and basic are two ways that we describe chemical compounds. Acidity is measured using a pH scale. A pH scale runs from zero (the most acidic) to 14 (the most basic or alkaline). A substance that is neither basic or acidic is called "neutral", and this has a pH of 7.