2 Na₂CrO₄ + 3 Na₂SO₃ + 5 H₂O → 2 Cr(OH)₃ + 3 Na₂SO₄ + 4 Na(OH)

This is an oxidation-reduction (redox) reaction:

Na₂SO₃ is a reducing agent, Na₂CrO₄ is an oxidizing agent.

Reactants:

• 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
• Na₂SO₃ – Sodium sulfite
  • Other names: Sodium sulphite , Hypo clear (photography) , E221 ... show moreNa2SO3 , Anhydrous sodium sulfite , Sodium sulfite anhydrous , Sulfurous acid, disodium salt , Dried sodium sulfite , Disodium sulfite show less
  • Appearance: White solid ; White crystals or powder
• 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

Products:

• Cr(OH)₃ – Chromium(3+) hydroxide
  • Other names: Chromium(III) hydroxide , Chromium (iii) hydroxide hydrate , Cr(OH)3 , Chromic (III) hydroxide hydrate
  • Appearance: Green, gelatinous precipitate ; Blue-to-green powder or black particles
• 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
• Na(OH)