The electrolysis of aqueous sodium iodide involves the discharge of ions at the electrodes. The I- ion is preferentially discharged at the anode, despite standard electrode potential values suggesting that the OH- ion should be discharged instead. This discrepancy aligns with the principles outlined in GCSE chemistry, which emphasize the preferential discharge of halide ions over hydroxide ions. Therefore, the correct understanding is that during the electrolysis of sodium iodide, I- is discharged at the anode.
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