SO32- + 2 (Fe)3+ + H2O → 2 (Fe)2+ + 2 H+ + SO42-

This is an oxidation-reduction (redox) reaction:

SIV - 2 e- → SVI (oxidation)

2 FeIII + 2 e- → 2 FeII (reduction)

SO32- is a reducing agent, Fe3+ is an oxidizing agent.

Reactants:

  • SO32-
  • Fe3+
  • H2O – Water, oxidane source: wikipedia, accessed: 2019-09-27
    • Other names: Water (H2O) source: wikipedia, accessed: 2019-09-27, Hydrogen hydroxide (HH or HOH) source: wikipedia, accessed: 2019-09-27, Hydrogen oxide source: wikipedia, accessed: 2019-09-27
    • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas source: wikipedia, accessed: 2019-09-27

Products:

  • Fe2+
  • H+
  • SO42- – Sulfate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-07
    • Other names: Sulfate ion source: wikidata, accessed: 2019-09-07, Sulphate ion source: wikidata, accessed: 2019-09-07, Sulphate source: wikidata, accessed: 2019-09-07