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Year 12 Chemistry Coursework The Magnesium Statue Niall Boyle 12E Planning The Problem A statue, which is made of an alloy consisting mainly of magnesium, corrodes at different rates, at different times of the year. Background Knowledge There are some areas of knowledge that should be taken into consideration to help in devising an experiment to help determine the cause of the problem, and which gave me a greater understanding of the problem. A major factor in the decay of the statue is acid rain, which prevents the formation of the oxide coat that would normally form on magnesium preventing corrosion in air. Rain is naturally acidic, due to the CO2 dissolved in it, however when sulphur dioxide and oxides of nitrogen react with the rain water they form sulphuric, and nitric acids which make the rain strongly acidic. SO2 + 1/2O2 + H2O › H2SO4 It may also take the form of snow or fog. The sulphur dioxides...

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