2 Fe + 6 HCl 3 H2 + 2 FeCl3

This is an oxidation-reduction (redox) reaction:

6 HI + 6 e- 6 H0 (reduction)

2 Fe0 - 6 e- 2 FeIII (oxidation)

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


  • Fe
    • Names: Iron source: wikidata, accessed: 2019-09-07, Fe source: wikidata, accessed: 2019-09-07, Element 26 source: wikidata, accessed: 2019-09-07
  • HClChlorane source: wikipedia, accessed: 2019-09-27, Hydrogen chloride source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02
    • Other names: Hydrochloric acid source: wikipedia, accessed: 2019-09-27source: NIOSH NPG, accessed: 2019-09-02, Hydrochloric acid gas source: wikipedia, accessed: 2019-09-27, HCl source: wikidata, accessed: 2019-09-02
    • Appearance: Colorless, transparent liquid, fumes in air if concentrated source: wikipedia, accessed: 2019-09-27; Colorless gas source: wikipedia, accessed: 2019-09-27; Colourless compressed liquefied gas with pungent odour source: ICSC, accessed: 2019-09-04; Colorless to slightly yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.] source: NIOSH NPG, accessed: 2019-09-02


  • H2
    • Names: Dihydrogen source: wikidata, accessed: 2019-09-07, Hydrogen source: ICSC, accessed: 2019-09-04source: wikidata, accessed: 2019-09-07, H2 source: wikidata, accessed: 2019-09-07
    • Appearance: Odourless colourless compressed gas source: ICSC, accessed: 2019-09-04
  • FeCl3Iron(III) chloride source: wikipedia, accessed: 2019-09-27source: ICSC, accessed: 2019-09-04, Iron trichloride source: wikipedia, accessed: 2019-09-27source: ICSC, accessed: 2019-09-04
    • Other names: Ferric chloride source: wikidata, accessed: 2019-09-02, Ferric chloride (anhydrous) source: ICSC, accessed: 2019-09-04, Iron(3+);trichloride source: wikidata, accessed: 2019-09-02
    • Appearance: Green-black by reflected light; purple-red by transmitted light; yellow solid as hexahydrate; brown as solution source: wikipedia, accessed: 2019-09-27; Black-to-brown hygroscopic crystals source: ICSC, accessed: 2019-09-04