Sulfur (IV) oxide SO2 is an oxide that exhibits acidic properties and forms the corresponding oxygen-containing acid H2SO3. Acidic oxides interact with water, bases, amphoteric and basic oxides. In addition, they are able to enter into redox reactions.
SO2 interacts with NaOH, Ca (OH) 2, H2O.
SO2 + H2O = H2SO3
Depending on the ratio of reagents:
SO2 + 2NaOH = Na2SO3 + 2H2O or SO2 + NaOH = NaHSO3
SO2 + Ca (OH) 2 = CaSO3 + H2O or 2SO2 + Ca (OH) 2 = Ca (HSO3) 2
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