Fe3O4 + 4 H2SO4 → FeSO4 + Fe2(SO4)3 + 4 H2O – Balanced equation

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This is an acid-base reaction (neutralization): Fe₃O₄ is a base, H₂SO₄ is an acid.

This is an oxidation-reduction (redox) reaction:

Fe^8/3 + 2/3 e^- → Fe^II (reduction)

2 Fe^8/3 - 2/3 e^- → 2 Fe^III (oxidation)

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Fe₃O₄ is both an oxidizing and a reducing agent (disproportionation (dismutation)).

Reactants:

Fe₃O₄ – Iron(II) iron(III) oxide
- Other names: Iron(II,III) oxide , Ferrous ferric oxide , Ferroso ferric oxide
- Appearance: Solid black powder
H₂SO₄ – Sulfuric acid
- Other names: Oil of vitriol , Sulfuric acid, concentrated (> 51% and , H2SO4
- Appearance: Clear, colorless liquid ; Odourless colourless oily hygroscopic liquid ; Colorless to dark-brown, oily, odorless liquid. [Note: Pure compound is a solid below 51°F. Often used in an aqueous solution.]

Products:

FeSO₄ – Iron(II) sulphate
- Other names: Iron(II) sulfate , Ferrous sulfate , Green vitriol
- Appearance: White crystals (anhydrous) | White-yellow crystals (monohydrate) | Blue-green crystals (heptahydrate)
Fe₂(SO₄)₃ – Iron(III) sulfate
- Other names: Ferric sulfate , Sulfuric acid , Iron(3+) salt (3:2)
- Appearance: Grayish-white crystals
H₂O – Water, 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