what is a acid rain? answer in 250-300 words. pls answer only brainliest AnsWers.....
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Answers
Answer:
Acid Rain
What is Acid Rain?
Acid rain is a result of air pollution. When any type of fuel is burnt, lots of different chemicals are produced. The smoke that comes from a fire or the fumes that come out of a car exhaust don't just contain the sooty grey particles that you can see - they also contains lots of invisible gases that can be even more harmful to our environment.
Power stations, factories and cars all burn fuels and therefore they all produce polluting gases. Some of these gases (especially nitrogen oxides and sulphur dioxide) react with the tiny droplets of water in clouds to form sulphuric and nitric acids. The rain from these clouds then falls as very weak acid - which is why it is known as "acid rain".
How acidic is acid rain?
Acidity is measured using a scale called the pH scale. This scale goes from 0 to 14. 0 is the most acidic and 14 is the most alkaline (opposite of acidic). Something with a pH value of 7, we call neutral, this means that it is neither acidic nor alkaline.
Very strong acids will burn if they touch your skin and can even destroy metals. Acid rain is much, much weaker than this, never acidic enough to burn your skin.
Rain is always slightly acidic because it mixes with naturally occurring oxides in the air. Unpolluted rain would have a pH value of between 5 and 6. When the air becomes more polluted with nitrogen oxides and sulphur dioxide the acidity can increase to a pH value of 4. Some rain has even been recorded as being pH2.
Vinegar has a pH value of 2.2 and lemon juice has a value of pH2.3. Even the strongest recorded acid rain is only about as acidic as lemon juice or vinegar and we know that these don't harm us - so why do we worry about acid rain?
Answer:
Acid rain is one of the consequences of air pollution. It occurs when emissions from factories, cars or heating boilers contact with the water in the atmosphere. These emissions contain nitrogen oxides, sulfur dioxide and sulfur trioxide, which when mixed with water become sulfurous acid, nitric acid and sulfuric acid. This process also occurs naturally through volcanic eruptions.The resulting acids are precipitated to earth as rain or snow with very negative consequences: on the one hand the damage to nature in the form of acidification of soils, lakes and seas with consequent damage to terrestrial and marine flora and fauna. On the other hand, acid rain also causes corrosion of metallic elements -buildings, bridges, towers and other structures- and the destruction of human heritage made of limestone -buildings and historic structures, statues, sculptures.Acid rain itself is not harmful to humans, ie, the skin contact with contaminated water or snow does not pose a health risk. However, the gases that cause this rain (nitrogen oxides, sulfur dioxide and sulfur trioxide), are harmful. These gases contain particles of sulfate and nitrate and are carried by the wind and inhaled by people causing respiratory diseases.The only way to stop acid rain is to reduce emissions that cause it. This involves betting on renewable energy sources and reducing the use of fossil fuels in the industrial and automotive sector and in the daily life of every citizen.
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