The peroxodisulfate ion can oxidize iodide ions to iodine according to the balanced equation S₂O₈^2- + 2I ^- $\rarr$ 2SO₄^2- + I₂.The reaction is catalyzed by certain chemical species. Identify the catalyst in the following mechanism:
Step 1: Fe³⁺ + 2I ^- $\rarr$ Fe²⁺ + I₂
Step 2: S₂O₈^2- + Fe²⁺ $\rarr$ 2SO₄^2- + Fe³⁺

Question

The peroxodisulfate ion can oxidize iodide ions to iodine according to the balanced equation S₂O₈^2- + 2I ^-

\rarr

2SO₄^2- + I₂.The reaction is catalyzed by certain chemical species. Identify the catalyst in the following mechanism:
Step 1: Fe³⁺ + 2I ^-

\rarr

Fe²⁺ + I₂
Step 2: S₂O₈^2- + Fe²⁺

\rarr

2SO₄^2- + Fe³⁺

Quizplus · Accepted Answer

Fe³⁺ is the catalyst because it is regenerated at the end of the reaction mechanism. It is consumed in step 1 and regenerated in step 2.

The Peroxodisulfate Ion Can Oxidize Iodide Ions to Iodine According →\rarr→