Neco Model Questions Vol1 2022 Chemistry Question 12
Practice objective / multiple choice question 12 from the 2022 Neco Model Questions Vol1 Chemistry examination.
An impure sample of ferrous sulfate heptahydrate (\(\mathrm{FeSO_{4}\cdot7H_{2}O}\)) weighing \(5.00\) g is dissolved in water and diluted to a final volume of \(250.0\) mL. A \(25.00\) mL aliquot of this solution is titrated with \(0.0200\) M potassium permanganate (\(\mathrm{KMnO_{4}}\)) in acidic medium. The reaction is \(\mathrm{MnO_{4}^{-} + 5Fe^{2+} + 8H^{+} \rightarrow Mn^{2+} + 5Fe^{3+} + 4H_{2}O}\). The volume of \(\mathrm{KMnO_{4}}\) required is \(12.5\) mL. Determine the percent purity of the original sample, assuming only \(\mathrm{FeSO_{4}\cdot7H_{2}O}\) contributes ferrous ions.
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About This Question
This is Neco Model Questions Vol1 2022 Chemistry Question 12. It is one of the objective questions from the 2022 Neco Model Questions Vol1 Chemistry examination.
Difficulty level: Medium .
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