2 HAuCl₄ + 3 SnCl₂ → 2 Au + 3 SnCl₄ + 2 HCl

This is an oxidation-reduction (redox) reaction:

HAuCl₄ is an oxidizing agent, SnCl₂ is a reducing agent.

Reactants:

• HAuCl₄
  • Names: Chloroauric acid , Hydrogen tetrachloroaurate , Chlorauric acid ... show moreAurochloric acid , Aurate(1−) , Tetrachloro- , Hydrogen , (SP-4-1)- , Hydrogen aurichloride show less
  • Appearance: Orange-yellow needle-like crystals | hygroscopic
• 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:

• Au
  • Names: Gold , Au , Element 79 , Aurum
• 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
• 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.]