Fe3O4 + 8 HI → 3 FeI2 + I2 + 4 H2O – Balanced equation

Or you want a quick look:

This is an acid-base reaction (neutralization): Fe3O4 is a base, HI is an acid.

This is an oxidation-reduction (redox) reaction:

2 I-I - 2 e- 2 I (oxidation)

3 Fe8/3 + 2 e- 3 FeII (reduction)

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HI is a reducing agent, Fe3O4 is an oxidizing agent.

Reactants:

  • Fe3O4Iron(II) iron(III) oxide
    • Other names: Iron(II,III) oxide , Ferrous ferric oxide , Ferroso ferric oxide
    • Appearance: Solid black powder
  • HIIodane
    • Other names: Hydroiodic acid , Hydrogen iodide , Hydronium iodide
    • Appearance: Colorless liquid ; Colorless gas ; Colourless compressed liquefied gas with pungent odour

Products:

  • FeI2Iron(II) iodide
    • Other names: Ferrous iodide
    • Appearance: White to off-white powder
  • I2
    • Names: Iodine , Jod , Iode
    • Appearance: Bluish black or dark purple crystals with pungent odour ; Violet solid with a sharp, characteristic odor.
  • H2OWater, oxidane
    • Other names: Water (H2O) , Hydrogen hydroxide (HH or HOH) , Hydrogen oxide
    • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas
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