Waec Model Questions Vol1 2021 Chemistry Question 21
Practice objective / multiple choice question 21 from the 2021 Waec Model Questions Vol1 Chemistry examination.
A 200.0 mL solution contains Fe²⁺ and Cr²⁺ ions. It is titrated with 0.0200 M KMnO₄ in acidic medium. Exactly 25.0 mL of the KMnO₄ solution is added, which first oxidises all Fe²⁺ and then partially oxidises Cr²⁺. The excess KMnO₄ remaining after the reaction is back‑titrated with 0.0100 M Fe²⁺ solution, requiring 10.0 mL. If the original concentration of Cr²⁺ was 0.0050 M, calculate the original concentration of Fe²⁺ in the mixture.
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About This Question
This is Waec Model Questions Vol1 2021 Chemistry Question 21. It is one of the objective questions from the 2021 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Medium .
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