Topic 9 ReactionsofAcids. Acid Rain Acid rain occurs when acidic gases in the air dissolve in rain water. The main substance responsible for acid rain.

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Topic 9 ReactionsofAcids

Acid Rain Acid rain occurs when acidic gases in the air dissolve in rain water. The main substance responsible for acid rain is sulphur dioxide gas; produced by burning coal. Sulphur + Oxygen  Sulphur dioxide S + O 2  SO 2

Acidic gasWhere it comes from Carbon dioxide Naturally present (respiration) Increased by burning of fossil fuels Sulphur dioxide From power stations (burning sulphur in fossil fuels) Nitrogen oxides From sparking of air in petrol engines

Damage caused Buildings Carbonates in some stone and some mortar dissolve in acid Metal structures Steel and several other metals are dissolved by acid Plants Most cannot grow in very acidic soils; leaves damaged by acid rain. Fish Cannot live in acidic lake or river water

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