A-LevelChemistryAnalytical techniquesMay/June 2017Paper 3 Q112 Marks
In this experiment you will determine the relative formula mass of a copper salt by titration. A solution of the copper salt reacts with excess acidified potassium iodide, producing iodine. This iodine is then titrated with aqueous sodium thiosulfate, using starch indicator. FA 1 is an aqueous solution of the copper salt prepared by dissolving 26.0g of the salt to make 1.00 dm³ of solution. FA 2 is dilute sulfuric acid, H2SO4. FA 3 is aqueous potassium iodide, KI. FA 4 is 0.110 moldm⁻³ sodium thiosulfate, Na2S2O3. starch indicator
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