4 SO32- + Cr2O72- + 6 H+ 2 (Cr)2+ + 4 SO42- + 3 H2O

This is an oxidation-reduction (redox) reaction:

4 SIV - 8 e- 4 SVI (oxidation)

2 CrVI + 8 e- 2 CrII (reduction)

SO32- is a reducing agent, Cr2O72- is an oxidizing agent.

Reactants:

  • SO32-
  • Cr2O72-
  • H+

Products:

  • Cr2+
  • 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
  • H2OWater, 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