AQA Jan 2011 Paper 2 Q5

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do not write outside the box a sea water contains large amounts of dissolved magnesium compounds approximately kg of magnesium can be extracted from dm of sea water the first step in the extraction process is to react the magnesium ions in sea water with hydroxide ions to produce a precipitate of magnesium hydroxide write the simplest ionic equation for this reaction mark b the second step in the extraction process is to react magnesium hydroxide with hydrochloric acid to give magnesium chloride write an equation for this reaction mark c in the final step molten magnesium chloride is electrolysed to form magnesium and chlorine this is similar to the method used to extract aluminium deduce an equation for the reaction that occurs at the negative electrode in the electrolysis of magnesium chloride mark d magnesium is used in the extraction of titanium d i write an equation for the conversion of titanium iv oxide into titanium iv chloride marks d ii write an equation for the extraction of titanium from titanium iv chloride using magnesium mark d iii state the role of magnesium in this extraction mark wmp jan chem e use your knowledge of the reactions of group metals with water to explain why water should not be used to put out a fire in which magnesium metal is burning marks extra space do not write outside the box turn over for the next question turn over wmp jan chem

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