2 CrO₄^2- + 3 SO₃^2- + 5 H₂O → 2 [Cr(OH)₃] + 3 SO₄^2- + 4 OH^-

This is a complexation reaction: [Cr(OH)₃] is the formed complex.

This is an oxidation-reduction (redox) reaction:

SO₃^2- is a reducing agent, CrO₄^2- is an oxidizing agent.

Reactants:

• CrO₄^2-
• SO₃^2-
• H₂O – Water, oxidane
  • Other names: Water (H2O) , Hydrogen hydroxide (HH or HOH) , Hydrogen oxide ... show moreDihydrogen monoxide (DHMO) (systematic name) , Hydrogen monoxide , Dihydrogen oxide , Hydric acid , Hydrohydroxic acid , Hydroxic acid , Hydrol , Μ-oxido dihydrogen , Κ1-hydroxyl hydrogen(0) show less
  • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas

Products:

• [Cr(OH)₃]
• SO₄^2- – Sulfate
  • Other names: Sulfate ion , Sulphate ion , Sulphate
• OH^- – Hydroxide
  • Other names: Hydroxide ion