IB Chemistry Quiz
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SKILLS IN THE STUDY OF CHEMISTRY
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A student is performing a redox titration using potassium permanganate (KMnO₄) as the titrant against an unknown concentration of iron(II) sulfate solution. The reaction is: 5Fe²⁺ + MnO₄⁻ + 8H⁺ → 5Fe³⁺ + Mn²⁺ + 4H₂O
During the titration, the student observes that the endpoint color change (from colorless to pale pink) appears gradually over 10-15 seconds rather than sharply. After adding one additional drop, the solution becomes deep purple. What is the most likely cause of this observation and how should the student proceed?
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