2 H₂[Hg(Cl)₄] + SnCl₂ → SnCl₄ + Hg₂Cl₂ + 4 HCl

This is an oxidation-reduction (redox) reaction:

SnCl₂ is a reducing agent, H₂[Hg(Cl)₄] is an oxidizing agent.

Reactants:

• H₂[Hg(Cl)₄]
• SnCl₂ – Tin(II) chloride , Tin dichloride
  • Other names: Stannous chloride , Tin salt , Tin protochloride ... show moreTin (ii) chloride (anhydrous) , Stannous chloride (anhydrous) , Stannous chloride (anh.) , Tin dichloride (anhydrous) , Tin(II) chloride (anhydrous) , SnCl2 , Tin(II) chloride (anh.) , Stannous chloride anhydrous , Stannous chloride,anhydrous show less
  • Appearance: White crystalline solid ; Colourless or white crystals

Products:

• SnCl₄ – Tetrachlorostannane , Tin tetrachloride , Tin(IV) chloride
  • Other names: Stannic chloride , Tin(iv) chloride (anhydrous)
  • Appearance: Colorless to slightly yellow fuming liquid ; Colourless or slightly yellow fuming liquid with pungent odour
• Hg₂Cl₂ – Dimercury dichloride
  • Other names: Mercury(I) chloride , Mercurous chloride , Calomel ... show moreHg2Cl2 , ClHgHgCl , Mild mercury chloride , Mercury subchloride show less
  • Appearance: White solid ; White crystalline powder
• HCl – Chlorane , Hydrogen chloride
  • Other names: Hydrochloric acid , M , Uriatic acid ... show moreHydronium chloride , Chlorhydric Acid , Hydrochloric acid gas , HCl , Anhydrous hydrogen chloride , Hydrochloric acid, anhydrous , Aqueous hydrogen chloride , [Note: Often used in an aqueous solution.] show less
  • Appearance: Colorless, transparent liquid, fumes in air if concentrated ; Colorless gas ; Colourless compressed liquefied gas with pungent odour ; Colorless to slightly yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]