H₂SO₃ + Na₂O → Na₂SO₃ + H₂O

This is an acid-base reaction (neutralization): H₂SO₃ is an acid, Na₂O is a base.

Reactants:

• H₂SO₃ – Sulfurous acid
  • Other names: S(O)(OH)2 , Sulphurous acid
• Na₂O – Sodium oxide
  • Other names: Disodium oxide , Sodium monoxide , Disodium monoxide
  • Appearance: White solid ; White lumps or powder

Products:

• 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