SeO₃^2- + 2 SO₃^2- + 2 H⁺ → Se + 2 SO₄^2- + H₂O

This is an oxidation-reduction (redox) reaction:

SeO₃^2- is an oxidizing agent, SO₃^2- is a reducing agent.

Reactants:

• SeO₃^2-
• SO₃^2-
• H⁺

Products:

• Se
  • Names: Selenium , Se , Selen ... show moreElement 34 , 34Se , Elemental selenium , Selenium alloy show less
  • Appearance: Grey solid in various forms ; Amorphous or crystalline, red to gray solid. [Note: Occurs as an impurity in most sulfide ores.]
• SO₄^2- – Sulfate
  • Other names: Sulfate ion , Sulphate ion , Sulphate
• 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