2 CoCl2 + Na2O2 + 2 NaOH + 2 H2O → 2 Co(OH)3 + 4 NaCl

This is an oxidation-reduction (redox) reaction:

2 CoII - 2 e- → 2 CoIII (oxidation)

2 O-I + 2 e- → 2 O-II (reduction)

CoCl2 is a reducing agent, Na2O2 is an oxidizing agent.

Reactants:

  • CoCl2 – Cobalt(II) chloride source: wikipedia, accessed: 2019-09-27
    • Other names: Cobaltous chloride source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Cobalt dichloride source: wikipedia, accessed: 2019-09-27source: ICSC, accessed: 2019-09-04, Muriate of cobalt source: wikipedia, accessed: 2019-09-27
    • Appearance: Blue crystals (anhydrous) | violet-blue (dihydrate) | rose red crystals (hexahydrate) source: wikipedia, accessed: 2019-09-27; Pale blue hygroscopic powder. turns pink on exposure to air and moisture source: ICSC, accessed: 2019-09-04
  • Na2O2
    • Names: Sodium peroxide source: wikipedia, accessed: 2019-09-28source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Disodium dioxide source: wikipedia, accessed: 2019-09-28, Flocool source: wikipedia, accessed: 2019-09-28
    • Appearance: Yellow to white powder source: wikipedia, accessed: 2019-09-28; Yellow-to-white powder source: ICSC, accessed: 2019-09-04
  • NaOH
    • Names: Sodium hydroxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Caustic soda source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Lye source: wikidata, accessed: 2019-09-02
    • Appearance: White, waxy, opaque crystals source: wikipedia, accessed: 2019-09-27; White hygroscopic solid in various forms source: ICSC, accessed: 2019-09-04; Colorless to white, odorless solid (flakes, beads, granular form). 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

Products:

  • Co(OH)3 – Cobalt(III) hydroxide source: wikipedia, accessed: 2019-09-27
    • Other names: Cobaltic hydroxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-03
    • Appearance: Brown-black or dark green powder source: wikipedia, accessed: 2019-09-27
  • NaCl – Sodium chloride source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: {{unbulleted list source: wikipedia, accessed: 2019-09-27, Salt source: wikidata, accessed: 2019-09-02, Table salt source: wikidata, accessed: 2019-09-02
    • Appearance: Colorless cubic crystals source: wikipedia, accessed: 2019-09-27