8 (H2O)+ + 7 (SO3)2- + (Cr2O7)2- → 2 (Cr)3+ + 7 (SO4)2- + 8 H2O

This is an oxidation-reduction (redox) reaction:

7 SIV - 14 e- → 7 SVI (oxidation)

8 O-I + 8 e- → 8 O-II (reduction)

2 CrVI + 6 e- → 2 CrIII (reduction)

SO32- is a reducing agent, H2O+ is an oxidizing agent, Cr2O72- is an oxidizing agent.

Reactants:

  • H2O+
  • SO32-
  • Cr2O72-

Products:

  • Cr3+
  • 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
  • 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