Peroxodisulfate Ion Can Oxidize Iodide Ions to Iodine According to the Balanced

question 29

Multiple Choice

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⁺

• A)Fe³⁺
• B)I ^-
• C)S₂O₈^2-
• D)Fe²⁺
• E)SO₄^2-

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