6 ClO₂ + 56 NaOH + 5 Cr₂(SO₄)₃ → 15 Na₂SO₄ + 10 Na₂CrO₄ + 6 NaCl + 28 H₂O

This is an oxidation-reduction (redox) reaction:

ClO₂ is an oxidizing agent, Cr₂(SO₄)₃ is a reducing agent.

Reactants:

• ClO₂ – Chlorine dioxide , 4-chlorane (substitutive) OR Dioxidochlorine(•) (additive) -->
  • Other names: Chlorine(IV) oxide , Chlorine oxide , Chlorine peroxide ... show moreO2Cl(.) , [ClO2](.) , (OClO)(.) , Chlorine(IV)oxide show less
  • Appearance: Yellow to reddish gas ; Red-yellow gas with pungent odour ; Yellow to red gas or a red-brown liquid (below 52°F) with an unpleasant odor similar to chlorine and nitric acid.
• NaOH
  • Names: Sodium hydroxide , Caustic soda , Lye ... show moreSoda lye , Sodium hydrate , NaOH , White caustic , Lye [Sodium hydroxide] show less
  • Appearance: White, waxy, opaque crystals ; White hygroscopic solid in various forms ; Colorless to white, odorless solid (flakes, beads, granular form).
• Cr₂(SO₄)₃ – Chromium(III) sulfate
  • Other names: Basic chromium sulfate , Chromic sulfate
  • Appearance: Reddish-brown crystals (anhydrous), purple crystals (hydrated)

Products:

• Na₂SO₄
  • Names: Sodium sulfate , Sodium sulphate , Sulfate of sodium ... show moreThenardite (mineral) , Glauber's salt (decahydrate) , Sal mirabilis (decahydrate) , Mirabilite (decahydrate mineral) , Disodium sulfate , Anhydrous sodium sulfate , Sodium sulfate anhydrous , Sodium sulfate, anhydrous , Sodium sulphate anhydrous , Sodium sulphate, anhydrous , Sulfuric acid disodium salt, anhydrous , Disodium sulphate , Salt cake , Na2SO4 , Sulfuric acid disodium salt show less
  • Appearance: White crystalline solid | hygroscopic ; White hygroscopic solid in various forms
• Na₂CrO₄ – Sodium chromate
  • Other names: Chromic acid , (Na2CrO4) , Disodium salt ... show moreChromium disodium oxide , Rachromate , H2CrO4 , Chromic acid, disodium salt , Disodium chromate , Chromiumsodium oxide , Sodium chromate(VI) , Disodium chromate (VI) , Disodium chromium tetraoxide show less
  • Appearance: Yellow crystals ; Yellow hygroscopic crystals
• NaCl – Sodium chloride
  • Other names: {{unbulleted list , Salt , Table salt ... show moreCommon salt , NaCl , Broncho saline show less
  • Appearance: Colorless cubic crystals
• H₂O – Water, oxidane
  • Other names: Water (H2O) , Hydrogen hydroxide (HH or HOH) , Hydrogen oxide ... show moreDihydrogen monoxide (DHMO) (systematic name) , Hydrogen monoxide , Dihydrogen oxide , Hydric acid , Hydrohydroxic acid , Hydroxic acid , Hydrol , Μ-oxido dihydrogen , Κ1-hydroxyl hydrogen(0) show less
  • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas