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Can SO2 (Sulphur dioxide) be use to change Fe (III) salt to FE (II) salt? Thanks!?

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Can SO2 (Sulphur dioxide) be use to change Fe (III) salt to FE (II) salt? Thanks!?

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  1. Yes.  Look up the reduction potentials.  The reduction of SO4 2- to SO2 has a potential of .17V while that for the reduction of Fe3+ to Fe2+ has a potential of .77V.

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