Iron is an element that is essential in the human diet. Some people need to take iron supplement tablets to ensure an adequate intake of iron. You will investigate the mass of iron in an iron supplement tablet by titrating a solution with potassium manganate(VII). $$\[ \begin{gathered} \mathrm{Fe}^{2+}(\mathrm{aq}) \rightarrow \mathrm{Fe}^{3+}(\mathrm{aq})+\mathrm{e}^{-} \\ \mathrm{MnO}_{4}^{-}(\mathrm{aq})+8 \mathrm{H}^{+}(\mathrm{aq})+5 \mathrm{e}^{-} \rightarrow \mathrm{Mn}^{2+}(\mathrm{aq})+4 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \end{gathered} \]$$ FB 1 is an aqueous solution of iron supplement tablets made by dissolving 14 tablets in $$\(1.00 \mathrm{dm}^{3}\)$$ of solution. The iron in each tablet is iron(II) sulfate, $$\(\mathrm{FeSO}_{4} \bullet 7 \mathrm{H}_{2} \mathrm{O}\)$$. FB 2 is $$\(0.0100 \mathrm{~mol} \mathrm{dm}^{-3}\)$$ acidified aqueous potassium manganate(VII), $$\(\mathrm{KMnO}_{4}\)$$. FB 3 is dilute sulfuric acid, $$\(\mathrm{H}_{2} \mathrm{SO}_{4}\)$$. Method - Fill a burette with FB 2. - Pipette $$\(25.0 \mathrm{~cm}^{3}\)$$ of FB 1 into a conical flask. - Use the $$\(25 \mathrm{~cm}^{3}\)$$ measuring cylinder to add $$\(10.0 \mathrm{~cm}^{3}\)$$ of FB 3 to the conical flask. - Perform a rough titration and record your burette readings in the space below. The rough titre is $$\(\mathrm{cm}^{3}\)$$. - Carry out as many accurate titrations as you think necessary to obtain consistent results. - Make sure any recorded results show the precision of your practical work. - Record, in a suitable form in the space below, all your burette readings and the volume of FB 2 added in each accurate titration.

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