Ba(OH)2 + SO2 → BaSO3 + H2O – Balanced equation

Or you want a quick look:

This is an acid-base reaction (neutralization): Ba(OH)2 is a base, SO2 is an acid.

Reactants:

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  • Ba(OH)2
    • Names: Barium hydroxide , Caustic baryta , Barium hydroxide lime , Ba(OH)2
    • Appearance: White solid
  • SO2Sulfur dioxide
    • Other names: Sulfurous anhydride , Sulphur dioxide , Sulfurous acid anhydride
    • Appearance: Colorless gas ; Colourless gas or compressed liquefied gas with pungent odour ; Colorless gas with a characteristic, irritating, pungent odor. [Note: A liquid below 14°F. Shipped as a liquefied compressed gas.]

Products:

  • BaSO3Barium sulfite
    • Appearance: White monoclinic crystals
  • H2OWater, oxidane
    • Other names: Water (H2O) , Hydrogen hydroxide (HH or HOH) , Hydrogen oxide
    • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas
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