AQA Jun 2014 Paper 5 Q8

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do not write outside the box a student carried out an experiment to find the mass of feso h o in an impure sample x the student recorded the mass of x this sample was dissolved in water and made up to cm of solution the student found that after an excess of acid had been added cm of this solution reacted with cm of a mol dm solution of k cr o a use this information to calculate a value for the mass of feso h o in the sample of x marks wmp jun chem do not write outside the box b the student found that the calculated mass of feso h o was greater than the actual mass of the sample that had been weighed out the student realised that this could be due to the nature of the impurity suggest one property of an impurity that would cause the calculated mass of feso h o in x to be greater than the actual mass of x explain your answer marks end of questions wmp jun chem

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