AQA Jun 2011 Paper 5 Q8

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do not write outside the box a iron is an important element in living systems it is involved in redox and in acid base reactions explain how and why iron ions catalyse the reaction between iodide ions and s o ions write equations for the reactions that occur marks extra space question continues on the next page turn over wmp jun chem do not write outside the box b iron ii compounds are used as moss killers because iron ii ions are oxidised in air to form iron iii ions that lower the ph of soil b i explain with the aid of an equation why iron iii ions are more acidic than iron ii ions in aqueous solution marks b ii in a titration g of a moss killer reacted with cm of acidified mol dm k cr o solution calculate the percentage by mass of iron in the moss killer assume that all of the iron in the moss killer is in the form of iron ii marks wmp jun chem do not write outside the box c some sodium carbonate solution was added to a solution containing iron iii ions describe what you would observe and write an equation for the reaction that occurs marks end of questions wmp jun chem

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