Neco 2022 Chemistry Question 42
Practice objective / multiple choice question 42 from the 2022 Neco Chemistry examination.
A 25.00 mL solution containing an unknown mixture of \(\mathrm{Fe^{2+}}\) and \(\mathrm{Fe^{3+}}\) is titrated with 0.0200 M \(\mathrm{KMnO_4}\) in acidic medium. The reaction is \(\mathrm{MnO_4^- + 5Fe^{2+} + 8H^+ \rightarrow Mn^{2+} + 5Fe^{3+} + 4H_2O}\). The titration requires 15.00 mL of the permanganate solution to reach the endpoint. Independent analysis shows the solution also contains 5.0\times10^{-5} mol of a reducing impurity that reacts with \(\mathrm{KMnO_4}\) in a 1:1 mole ratio (ignoring \(\mathrm{H^+}\)). Determine the concentration of \(\mathrm{Fe^{2+}}\) (in mol\,L\(^{-1}\)) in the original mixture.
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About This Question
This is Neco 2022 Chemistry Question 42. It is one of the objective questions from the 2022 Neco Chemistry examination.
Difficulty level: Medium .
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