The reaction s2o82- 2 i- ------gt 2 so42- i2 proceeds, Ask an Expert

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The reaction S2O82- + 2 I- ------> 2 SO42- + I2 proceeds slowly in aqueous solution, but can be catalyzed by the Fe+3 ion. Given that Fe+3 can oxidize I- and Fe2+ can reduce S2O82-, write a plausible two-step mechanism for this reaction. Explain why the uncatalyzed reaction is slow.

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