AQA Jan 2012 Paper 5 Q6

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do not write outside the box an acidified solution of potassium manganate vii was reacted with a sample of sodium ethanedioate at a constant temperature of oc the concentration of the manganate vii ions in the reaction mixture was determined at different times using a spectrometer to measure the light absorbed the following results were obtained concentration of mno mol dm a write an equation for the reaction between manganate vii ions and ethanedioate ions in acidic solution time s marks extra space b by considering the properties of the reactants and products state why it is possible to use a spectrometer to measure the concentration of the manganate vii ions in this reaction mixture marks wmp jan chem do not write outside the box c this reaction is autocatalysed give the meaning of the term autocatalyst explain how the above curve indicates clearly that the reaction is autocatalysed meaning of autocatalyst explanation marks d identify the autocatalyst in this reaction mark e write two equations to show how the autocatalyst is involved in this reaction equation equation marks turn over for the next question turn over wmp jan chem

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