2 H2CrO4 + 12 H3O+ + 6 (Cl)- → 2 (Cr)3+ + 3 Cl2 + 20 H2O

This is an oxidation-reduction (redox) reaction:

6 Cl-I - 6 e- → 6 Cl0 (oxidation)

2 CrVI + 6 e- → 2 CrIII (reduction)

Cl- is a reducing agent, H2CrO4 is an oxidizing agent.

Reactants:

  • H2CrO4 – Chromic acid source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Dihydroxidodioxidochromium source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: Chromic(VI) acid source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Tetraoxochromic acid source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Sternochromicmaxidochorodium source: wikidata, accessed: 2019-09-02
  • H3O+
    • Names: Hydronium source: wikidata, accessed: 2019-09-07, Hydroxonium source: wikidata, accessed: 2019-09-07, H3O(+) source: wikidata, accessed: 2019-09-07
  • Cl-

Products:

  • Cr3+
  • 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