sky turning darkness...
wind blow strongly..
thunder shooting...
rain is coming...
this is the natural phenomenon of raining...
lol..let's get back to our main topic..
actually the main point of having this post is wan to talk about formation of acid rain..
hw acid rain have been form?? it is cause by???
Pure rain water in unpolluted areas have pH of about 5.6 which is weakly acid because the atmosphere contains of carbon dioxide an acidic oxide.
H2O (l) + CO2 (g) → H2CO3 (aq) → H+ + HCO3− (aq)
As years gone by, the countries are become more progress...
many industries are growing..this cause the atmosphere have been polluted..
at certain parts, exspecially highly industrialised areas, the pH can be even lower than 5.6 this is acid rain...
Acid rain is caused by a few factors, example:
-Burning of fossil fuels like coal, petroleum which contains sulfur as impurity.
S (s) + O2 (g) → SO2 (g)
-Smelting of ores like sulfide ores
2ZnS (s) + 3O2 (g) → 2ZnO (s) + 2SO2 (g)
-Hot vehicle engines exspecially when traffic jam produce NO2(g) an acidic oxide
N2 (g) + O2 (g) → 2NO (g)
2NO (g) + O2 (g) → 2NO2 (g)
-Even during lightning also will produce NO2 (g)
N2 (g) + O2 (g) → 2NO (g)
2NO (g) + O2 (g) → 2NO2 (g)
-Hot incinerators, furnaces also produce NO2 (g)
-Soil bacteria can also release NO2 (g) from nitrogeneous matter in soil.
-increased use of fertilisers also contribute release of NO2 (g) to the atmosphere.
From burning fossil fuels and smelting ores we get SO2 (g). When SO2 (g) added with oxygen we will get sulfur trioxide which is an acidic oxide. When it rains, all these acidic oxides will dissolve in rain water to form acid rain.
Effect of acid rain :
-It cause weathering of rocks which crumble
-Acid rain dissolves important nutrients and removes them from the soil, making them unavailable for plant growth
-Acid rain can displace aluminium and other heavy metals from the soil. These heavy metals are toxic it will make the plants die when there is too much aluminium ions in the soil
-Steel or iron building are attacked by acid rain cause it rusting, so that need to paint the building often
-Marble status are atteacked by acid rain and tend to destroy
-Many tree will loss their leaves due to acid rain, the plant cannot carry out photosynthesis when it loses all ots leaves, so eventually die
-The river will polluted by the acid rain, very low p of water lead the marine animals cannot survive
-Human being with bronchitis and asthma find their condition worsering due to acid rain
for the sake of all peoples good,we need to take some action for decreasing the formation of acid rain...
Controlling of acid rain :
-Those fossil fuel such as coal with a very low sulfur content should be burnt
-All combustion furnaces in factories and industries should have " flue gas desulfurisation" process attached. Scrubbers are used for this desulfuration process. Coal, air and CaCO3 are mixed in the combustion furnace.
S (s) + O2 (g) → SO2 (aq)
CaCO3 (s) → CaO (s) + CO2 (g)
CaO (s) + SO2 (g) → CaCO3 (s)
-All these products enter a scrubber where there is acid and water. CaCO3 turns into CaSO4 which can be used for making plasterboards.
-Minimise the usage of electrocity because electrocity is produce by burning of fossil fuels
-Minimise used of petrol due to this will also produce sulfur dioxide and nitrogen dioxide. We should depent on electric transport or public transport.
Hey guys, for our own good, please cooperate to reduce usega of fossil fuels for preventing form of acid rain~~
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