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Chemistry of Acid RainSulfuric acid and nitric acid are the main acids present in acid rain. Sulfuric acid is formed as follows: - Sulfur released into the atmosphere combines with atmospheric oxygen to form sulfur dioxide (SO2) - Sulfur dioxide reacts with atmospheric water to form sulfurous acid - SO2(g) + H20(l) = H2SO3(aq) - Sulfurous acid is also present in acid rain. - Sulfur dioxide gradually oxidizes to form sulfur trioxide (SO3) - 2SO2(g) = O2(g) = 2SO3(g) - Sulfur trioxide reacts with water to form Sulfuric acid (H2SO4) - SO3(g) + H20(l) = H2SO4(aq)
Nitrogen dioxide(NO2) is formed as follows:
- Nitrogen combines with atmospheric oxygen to form nitrogen dioxide (NO2). Nitrogen dioxide reacts with water to form nitrous acid (HNO2) and nitric acid (HNO3) - 2NO2(l) + H2O(l) = HNO2(aq) + HNO3(aq)
Acid rain is a mild combination of mainly sulfuric and nitric acid. Sulfurous acid and nitrous acid are less stable and are present only in very low amounts. Following are the various adverse effects of acid rain on living organisms and infrastructure. Buildings and Monuments:Acid rain causes severe damage to buildings and marble statues. Acid rain reacts with the calcium carbonate (CaCo3) to form soluble calcium hydrogen carbonate or calcium bicarbonate, Ca(HCO3)2 - CaCO3 + Acid rain = Ca(HCO3)2(aq) Calcium bicarbonate is a powdery substance, which is easily washed away with water or more specifically, rain water. This is the way acid rain has partly eroded many world-famous monuments and buildings like the Taj Mahal in India, St. Paul's Cathedral in London, and the Statue of Liberty in New York.
Acid rain can destroy stained glass windows in churches, bridges made of steel, and railway tracks. It corrodes metal, ruins the paint color, weakens leather and forms a crust on glass surfaces. Trees and Plants:Acid rain washes away important minerals from leaves and soil. Acid rain also blocks the small pores on the leaves' surface, through which they take in carbon dioxide. With improper functioning of leaves, the growth of trees gets retarded. This results in a loss of leaves, stunted growth and damaged bark. Such trees are more prone to attacks by fungi and insects. This can even result in the death of trees.
Soil:Soil contains many harmful minerals such as mercury and aluminum. These elements can't be absorbed by plants and trees and are thus harmless. Upon contact with acid rain, these chemicals undergo chemical reactions with the acids. As a result, compounds of aluminum, lead and mercury are formed. Plants and trees can easily absorb these compounds. Such elements, which are extremely harmful to living forms, ultimately affect the entire food chain. These chemicals not only harm the flora, but also the animals that feed on them. Water Bodies:Harmful substances like aluminum, lead and mercury, as discussed above, are washed away from the soil to neighboring water resources by the acid rain, thus resulting in water pollution. These chemicals and their acids do not allow the flora and fauna to grow and reproduce. This also results in depletion of oxygen levels in water, thereby making it difficult for fish to respire. They die due to suffocation and poisoning caused by the presence of these chemicals.
Birds that feed on fish that are affected by these harmful chemicals, accumulate these elements in their systems. These chemicals are then passed on to animals that feed on such birds. In this manner, chemicals get introduced to each trophic level of the food chain. In each trophic level, the concentration of chemicals gets multiplied. This phenomenon is known as biomagnification. Human Health:Acid rain is harmful to human health. Drinking water contaminated by aluminium, mercury and lead is highly dangerous for human health.
Acids are very small and fine particles. They are normally in a liquid state. When they are present in the atmosphere, they easily enter the lungs while breathing. Research has proven that these particles can even lead to cancer. Date: 2015-12-17; view: 1038
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