How does an acid rain form?
Asked by raoss1967 | 6th May, 2015, 12:12: PM
Formation of Acid rain
Oxides of nitrogen and sulphur interact with water vapour in the presence of sunlight in the atmosphere to form nitric acid and sulphuric acid mist, respectively. This mist remains as vapours at high temperature and condenses at low temperatures. These acids mix with rain (snow or fog) and fall down to the Earth resulting in acid rain.
Formation of sulphuric acid and sulphurous acid
Impurities in coal: Coal used in power plants contains up to 4% sulphur. On combustion, it forms pollutant sulphur dioxide (i.e. oxides of sulphur).
S + O2 → SO2
Sulphur dioxide reacts with water vapour to form sulphurous acid.
SO2 + H2O → H2SO3
Sulphur dioxide can also be oxidised to sulphur trioxide.
2SO2 + O2 → 2SO3
Sulphur trioxide reacts with water vapour to form sulphuric acid.
SO3 + H2O → H2SO4
Answered by Vaibhav Chavan | 6th May, 2015, 05:32: PM
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