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1. Acid Rain
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acid rain |
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ACID RAIN What is Acid Rain? The majority of people consider rain to be an undamaging weather occurrence. However the increase in acidity of rain is both unsafe and damaging. ... A change in only one unit is equal to a tenfold increase in the strength of the acid or base. ... Taking the above into consideration, it is easy to see how the normal phenomenon “rain” is becoming more and more acidic as its pH has dropped from around 6and 7 to about 4. ... This occurrence is known as Acid Rain and was first noted in1852 by the English chemist called Robert Angus Smith. Acid rain in other words is the term used to describe rainfall that has a pH level below5. ... How Acid Rain is formed The two most important primary sources of acid rain are sulphur dioxide (SO2) and oxides of nitrogen (NOx). ... The other gas primarily accountable for the formation of acid rain is nitrogen oxide. ... The acidity of acid rain does not only depend on the release levels of these gases but also on the chemical combination sulphur dioxide and nitrogen oxides interrelate in the atmosphere. Both gases undergo a few chemical reactions before they become the acids present in acid rain. ... This reaction has been found to be an unimportant supplier to the creation of sulphuric acid. ... SO2 (g) + o2 (g) à SO32- After this the sulphite ion forms sulphuric acid when it comes into contact with the moisture in the atmosphere. SO32- +H2O (l)à H2SO4 (aq) This reaction takes place quickly therefore the construction sulphur dioxide in the atmosphere is thought to lead to this kind of oxidation and form sulphuric acid. ... A third reaction for sulphur dioxide to become sulphuric acid is by the oxidation by ozone. ... The oxidation of sulphur dioxide is most widespread in clouds and particularly in greatly polluted air where there are abundant amounts of ammonia and ozone, which act as catalysts in the formation of sulphuric acid from sulphur dioxide. |
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Title: acid rain
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