2 CrO3 + 12 HCl → 2 CrCl3 + 3 Cl2 + 6 H2O

This is an oxidation-reduction (redox) reaction:

6 Cl-I - 6 e- → 6 Cl0 (oxidation)

2 CrVI + 6 e- → 2 CrIII (reduction)

HCl is a reducing agent, CrO3 is an oxidizing agent.

Reactants:

  • CrO3 – Chromium trioxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: Chromic anhydride source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Chromium(VI) oxide source: wikipedia, accessed: 2019-09-27, Chromic acid (misnomer) source: wikipedia, accessed: 2019-09-27
    • Appearance: Dark red granular solid, deliquescent source: wikipedia, accessed: 2019-09-27; Odourless dark red deliquescent crystals, flakes or granular powder source: ICSC, accessed: 2019-09-04
  • HCl – Chlorane 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, M source: wikipedia, accessed: 2019-09-27, Uriatic acid source: wikipedia, accessed: 2019-09-27
    • 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

Products:

  • CrCl3 – Chromium(III) chloride source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Chromium trichloride source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04
    • Other names: Chromic chloride source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Chromium(iii) chloride (anhydrous) source: ICSC, accessed: 2019-09-04, Chromium(3+) trichloride source: wikidata, accessed: 2019-09-02
    • Appearance: Purple (anhydrous), dark green (hexahydrate) source: wikipedia, accessed: 2019-09-27; Violet crystals source: ICSC, accessed: 2019-09-04
  • Cl2
    • Names: Chlorine source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Molecular chlorine source: NIOSH NPG, accessed: 2019-09-02
    • Appearance: Greenish-yellow compressed liquefied gas with pungent odour source: ICSC, accessed: 2019-09-04; Greenish-yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.] source: NIOSH NPG, accessed: 2019-09-02
  • H2O – Water, oxidane source: wikipedia, accessed: 2019-09-27
    • Other names: Water (H2O) source: wikipedia, accessed: 2019-09-27, Hydrogen hydroxide (HH or HOH) source: wikipedia, accessed: 2019-09-27, Hydrogen oxide source: wikipedia, accessed: 2019-09-27
    • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas source: wikipedia, accessed: 2019-09-27