AQA Jan 2012 Paper 5 Q7

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section b answer all questions in the spaces provided do not write outside the box a due to their electron arrangements transition metals have characteristic properties including catalytic action and the formation of complexes with different shapes give two other characteristic properties of transition metals for each property illustrate your answer with a transition metal of your choice marks b other than octahedral there are several different shapes shown by transition metal complexes name three of these shapes and for each one give the formula of a complex with that shape marks wmp jan chem do not write outside the box c it is possible for group metal ions to form complexes for example the ca h o ion in hard water reacts with edta ions to form a complex ion in a similar manner to hydrated transition metal ions this reaction can be used in a titration to measure the concentration of calcium ions in hard water c i write an equation for the equilibrium that is established when hydrated calcium ions react with edta ions mark c ii explain why the equilibrium in part c i is displaced almost completely to the right to form the edta complex marks c iii in a titration cm of a mol dm solution of edta reacted completely with the calcium ions in a cm sample of a saturated solution of calcium hydroxide calculate the mass of calcium hydroxide that was dissolved in dm of the calcium hydroxide solution marks extra space turn over wmp jan chem

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