4 FeS₂ + 19 Na₂O₂ → 8 Na₂SO₄ + 2 Fe₂O₃ + 11 Na₂

This is an oxidation-reduction (redox) reaction:

FeS₂ is a reducing agent, Na₂O₂ is an oxidizing agent, FeS₂ is a reducing agent, Na₂O₂ is an oxidizing agent.

Reactants:

• FeS₂
  • Names: Ferrous disulfide , Fool's gold , Iron disulfide ... show moreIron persulfide , FeS2 show less
• Na₂O₂
  • Names: Sodium peroxide , Disodium dioxide , Flocool ... show moreSolozone , Disodium peroxide , Sodium dioxide , Sodium superoxide show less
  • Appearance: Yellow to white powder ; Yellow-to-white powder

Products:

• Na₂SO₄
  • Names: Sodium sulfate , Sodium sulphate , Sulfate of sodium ... show moreThenardite (mineral) , Glauber's salt (decahydrate) , Sal mirabilis (decahydrate) , Mirabilite (decahydrate mineral) , Disodium sulfate , Anhydrous sodium sulfate , Sodium sulfate anhydrous , Sodium sulfate, anhydrous , Sodium sulphate anhydrous , Sodium sulphate, anhydrous , Sulfuric acid disodium salt, anhydrous , Disodium sulphate , Salt cake , Na2SO4 , Sulfuric acid disodium salt show less
  • Appearance: White crystalline solid | hygroscopic ; White hygroscopic solid in various forms
• Fe₂O₃ – Iron(III) oxide
  • Other names: Ferric oxide , Hematite , Ferric iron ... show moreRed iron oxide , Rouge , Maghemite , Colcothar , Iron sesquioxide , Rust , Ochre , Iron oxide dust and fume (as Fe) , Iron oxide red , Red oxide , Anhydrous ferric oxide , Iron (III) oxide , Diiron trioxide , Iron trioxide , Ferric sesquioxide , Iron(III) oxide [Iron oxide dust and fume (as Fe)] , Iron(III)oxide [Rouge] show less
  • Appearance: Red-brown solid ; Reddish brown-to-black crystals or powder ; Reddish-brown solid. [Note: Exposure to fume may occur during the arc-welding of iron.] ; A fine, red powder of ferric oxide. [Note: Usually used in cake form or impregnated in paper or cloth.]
• Na₂