Gce Model Questions Vol1 2022 Chemistry Question 12
Practice objective / multiple choice question 12 from the 2022 Gce Model Questions Vol1 Chemistry examination.
A 25.0 cm³ sample of an aqueous solution of \( \mathrm{Fe^{2+}} \) is titrated with 0.100 mol dm⁻³ \( \mathrm{KMnO_4} \) solution. In acidic medium the reaction is\n\[ \mathrm{MnO_4^- + 5 Fe^{2+} + 8 H^+ \rightarrow Mn^{2+} + 5 Fe^{3+} + 4 H_2O} \]\nThe volume of \( \mathrm{KMnO_4} \) required to reach the endpoint is 18.2 cm³.\n(a) Calculate the concentration of \( \mathrm{Fe^{2+}} \) in the original sample.\n(b) If the original sample was prepared by dissolving an unknown mass of ferrous ammonium sulfate hexahydrate \( \mathrm{(NH_4)_2Fe(SO_4)_2·6H_2O} \) in 250.0 cm³ water, determine the mass of the salt present.
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This is Gce Model Questions Vol1 2022 Chemistry Question 12. It is one of the objective questions from the 2022 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Medium .
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