Why does sodium sulfite have to be acidified in the reduction of $\ce{Fe^{3+}}$ to $\ce{Fe^{2+}}$?

Does the acid act simply as a catalyst or is it necessary for the reduction process?

  • $\begingroup$ You'd have some problem with reducing precipitate... $\endgroup$ – Mithoron Jul 23 '17 at 17:09
  • $\begingroup$ Please help me pls $\endgroup$ – Jack Aug 10 '17 at 11:51

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