2 HCl (aq) + Fe (s) → H₂ (g) + FeCl₂ (aq)

This is an oxidation-reduction (redox) reaction:

HCl is an oxidizing agent, Fe is a reducing agent.

Reactants:

• 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.]
• Fe
  • Names: Iron , Fe , Element 26 ... show moreFer , 26Fe , Eisen , Ferrum , Hierro , Carbonyl iron , Electrolytic iron , Ferrum metallicum , Iron powder , Iron, carbonyl , Iron, electrolytic , Iron, elemental , Iron, reduced , Reduced iron show less

Products:

• H₂
  • Names: Dihydrogen , Hydrogen , H2 ... show moreH₂ , Molecular hydrogen gas , Hydrogen gas , Hydrogen molecule , Molecular hydrogen show less
  • Appearance: Odourless colourless compressed gas
• FeCl₂ – Iron(II) chloride , Iron dichloride
  • Other names: Ferrous chloride , Rokühnite , [FeCl3] , FeCl3
  • Appearance: Tan solid (anhydrous) | Pale green solid (di-tetrahydrate) ; White-to-light-green hygroscopic crystals