2 Cr(OH)3 + 4 OH- + IO3- → 2 CrO42- + (I)- + 5 H2O

This is an oxidation-reduction (redox) reaction:

IV + 6 e- → I-I (reduction)

2 CrIII - 6 e- → 2 CrVI (oxidation)

IO3- is an oxidizing agent, Cr(OH)3 is a reducing agent.

Reactants:

  • Cr(OH)3 – Chromium(3+) hydroxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: Chromium(III) hydroxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Chromium (iii) hydroxide hydrate source: ICSC, accessed: 2019-09-04, Cr(OH)3 source: wikidata, accessed: 2019-09-02, Chromic (III) hydroxide hydrate source: ICSC, accessed: 2019-09-04
    • Appearance: Green, gelatinous precipitate source: wikipedia, accessed: 2019-09-27; Blue-to-green powder or black particles source: ICSC, accessed: 2019-09-04
  • OH- – Hydroxide source: wikipedia, accessed: 2019-09-27
    • Other names: Hydroxide ion source: wikidata, accessed: 2019-09-07
  • IO3-

Products:

  • CrO42-
    • I-
    • 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