3 Hg(NO₃)₂ + 6 FeSO₄ → 2 Fe(NO₃)₃ + 2 Fe₂(SO₄)₃ + 3 Hg

This is an oxidation-reduction (redox) reaction:

Hg(NO₃)₂ is an oxidizing agent, FeSO₄ is a reducing agent.

Reactants:

• Hg(NO₃)₂
  • Names: Mercuric nitrate , Mercury (II) nitrate , Mercury dinitrate
  • Appearance: Colourless crystals or white hygroscopic powder
• FeSO₄ – Iron(II) sulphate
  • Other names: Iron(II) sulfate , Ferrous sulfate , Green vitriol ... show moreIron vitriol , Copperas , Melanterite , Szomolnokite , Ferrous sulfate , Iron sulfate (1:1) , Iron(II) sulfate (1:1) , Ferrous sulfate (anhydrous) , Ferrous sulfate (anh.) , Iron(2+) sulfate (anh.) , FeSO4 , Fe(II)SO4 , Ferrous sulfate anhydrous show less
  • Appearance: White crystals (anhydrous) | White-yellow crystals (monohydrate) | Blue-green crystals (heptahydrate)

Products:

• Fe(NO₃)₃ – Iron(III) nitrate
  • Other names: Ferric nitrate , Nitric acid , Iron(3+) salt , Iron (III) nitrate
  • Appearance: Pale violet crystals | hygroscopic
• Fe₂(SO₄)₃ – Iron(III) sulfate
  • Other names: Ferric sulfate , Sulfuric acid , Iron(3+) salt (3:2) ... show moreDiiron tris(sulphate) , Iron tersulfate , Iron sesquisulfate , Iron persulfate , Ferric tersulfate , Ferric sesquisulfate , Ferric persulfate , Diiron trisulfate , Iron(III) sulfate(VI) , Ferric sulfate anhydrous show less
  • Appearance: Grayish-white crystals
• Hg
  • Names: Mercury , Hg , Quicksilver ... show moreHydrargyrum , Element 80 , Liquid silver show less
  • Appearance: Odourless heavy mobile silvery liquid metal