3 H₂S + Fe₂O₃ → 3 H₂O + S + 2 FeS

This is an acid-base reaction (neutralization): H₂S is an acid, Fe₂O₃ is a base.

This is an oxidation-reduction (redox) reaction:

H₂S is a reducing agent, Fe₂O₃ is an oxidizing agent.

Reactants:

• H₂S – Hydrogen sulfide
  • Other names: Dihydrogen monosulfide , Dihydrogen sulfide , Sewer gas ... show moreSulfane , Sulfurated hydrogen , Sulfureted hydrogen , Sulfuretted hydrogen , Sulfur hydride , Hydrosulfuric acid , Hydrothionic acid , Thiohydroxic acid , Sulfhydric acid , H2S , Hydrogen sulphide , [SH2] , Hydrogen monosulfide , Sulfide , Zwavelwaterstof , Sulfur hydroxide , Siarkowodor , Idrogeno solforato , Dihydrogen disulfide , Hydrosulfurate , Hepatate , Sour gas , Hepatic gas , Stink dAMP , Hepatic acid , Dihydrogen sulphide show less
  • Appearance: Colorless gas ; Colourless compressed liquefied gas with characteristic odour of rotten eggs ; Colorless gas with a strong odor of rotten eggs. [Note: Sense of smell becomes rapidly fatigued & can NOT be relied upon to warn of the continuous presence of H2S. Shipped as a liquefied compressed gas.]
• 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.]

Products:

• 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
• S
  • Names: Sulfur , S , Sulphur ... show moreElement 16 , Flowers of sulfur , Flour sulfur , Brimstone show less
  • Appearance: Yellow solid in various forms
• FeS
  • Names: Iron(II) sulfide , Iron sulfide , Ferrous sulfide ... show moreBlack iron sulfide , Protosulphuret of iron , Ferrous sulphide , Iron(II) sulphide show less
  • Appearance: Gray, sometimes in lumps or powder