Fe₂O₃ + 6 HI → 2 FeI₂ + I₂ + 3 H₂O

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

This is an oxidation-reduction (redox) reaction:

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

Reactants:

• 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.]
• HI – Iodane
  • Other names: Hydroiodic acid , Hydrogen iodide , Hydronium iodide ... show moreHI , Anhydrous hydriodic acid show less
  • Appearance: Colorless liquid ; Colorless gas ; Colourless compressed liquefied gas with pungent odour

Products:

• FeI₂ – Iron(II) iodide
  • Other names: Ferrous iodide
  • Appearance: White to off-white powder
• I₂
  • Names: Iodine , Jod , Iode ... show moreIodio , Yodo , Iodine crystals , Molecular iodine show less
  • Appearance: Bluish black or dark purple crystals with pungent odour ; Violet solid with a sharp, characteristic odor.
• 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