2 CrO72- + 28 H+ + 18 (I)- → 2 (Cr)3+ + 9 I2 + 14 H2O

This is an oxidation-reduction (redox) reaction:

18 I-I - 18 e- → 18 I0 (oxidation)

2 CrXII + 18 e- → 2 CrIII (reduction)

I- is a reducing agent, CrO72- is an oxidizing agent.

Reactants:

  • CrO72-
  • H+
  • I-

Products:

  • Cr3+
  • I2
    • Names: Iodine source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Jod source: ICSC, accessed: 2019-09-04, Iode source: ICSC, accessed: 2019-09-04
    • Appearance: Bluish black or dark purple crystals with pungent odour source: ICSC, accessed: 2019-09-04; Violet solid with a sharp, characteristic odor. 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