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Formation and Effects of Acid Rain Acid rain is rain that has had an oxide of an element dissolved in it. The most common one is Sulphur dioxide (SO2), which has the highest proportion of 70% of all acid rain. Acid rain is produced when fossil fuels are burnt and they release chemical energy emissions such as Sulphur dioxide, nitrogen oxide etc. These emissions stay in the atmosphere until they dissolve into the condensation of water (clouds). Prevailing winds take these clouds offshore (or a few miles away) and when it precipitates the rainwater that comes down is dilute sulphuric acid or dilute nitric acid. The PH Scale of substances. Substance PH Value Oven Spray cleaner 12.5 Alkali Ammonia Solution 11 Kitchen Surface Cleaner 10 More Alkali Sea water 8.2 Distilled Water 7 Neutral Milk 6.8 Washing up Liquid 5.5 'Normal' Rain Water 5 More Acidic Acid Rain 4.5 Apple 3.2 Vinegar 1.1 Lemons 2.5 Lowest recorded Acid Rain 2.4 Dilute Nitric Acid 1 Acidic In general acid rain is quite weak, as the graph shows, its weaker then the strength of apples. Although the acid is quite...

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