Question
Transition metals can act as catalysts because these can change their oxidation state. How does $Fe(III)$ catalyze the reaction between iodide and persulphate ions?
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Answer
Transition metals can act as catalysts because these can change their oxidation state. The reaction between iodide and persulphate ions catalyzes by Fe is as follows:
$2 I^{-}+S_2 O_8^{2-} \xrightarrow{Fe(III)} I_2+2 SO_4^{2-}$
Role of $Fe ( IIII )$ ions:
$2 Fe^{3+}+2 I^{-} \longrightarrow 2 Fe^{2+}+I_2$
$2 Fe^{2+}+S_2 O_8^{2-} \longrightarrow 2 Fe^{3+}+2 SO_4^{2-}$
$2 I^{-}+S_2 O_8^{2-} \xrightarrow{Fe(III)} I_2+2 SO_4^{2-}$
Role of $Fe ( IIII )$ ions:
$2 Fe^{3+}+2 I^{-} \longrightarrow 2 Fe^{2+}+I_2$
$2 Fe^{2+}+S_2 O_8^{2-} \longrightarrow 2 Fe^{3+}+2 SO_4^{2-}$
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