Leaving Cert Ireland · Chemistry

Oxidation and Reduction

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In an acidic solution, 10 mL of 0.02 mol/L Fe $^{2 +}$ is titrated with 0.04 mol/L KMnO $_{4}$ (MnO $_{4}^{-}$ + 5Fe $^{2 +}$ + 8H $^{+}$ → Mn $^{2 +}$ + 5Fe $^{3 +}$ + 4H $_{2}$ O). What volume of KMnO $_{4}$ is needed?
In the reaction Zn + Cu $^{2 +}$ → Zn $^{2 +}$ + Cu, which species is the reducing agent?

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