Answer:
SO₂ + H₂O → HSO₃⁻ + H⁺
Step-by-step explanation:
Assuming, you want to know the final balanced equation of this reaction, which is in words.
Sulfur dioxide reacts with water vapor to produce aqueous hydrogen sulfite and H⁺ ions(acidic).
Sulfur dioxide: SO₂(g)
Water vapor: H₂O(g)
Hydrogen sulfite: HSO₃⁻(aq)
Before putting them in the equation, check for each element's oxidation state to identify the nature of the reaction.
OS of S in SO₂ is +4, and in HSO₃⁻ is also +4.
OS of H and O remain +1 and -2, respectively.
SO₂ + H₂O → HSO₃⁻ + H⁺
This further reacts to form sulfur trioxide (SO₃) gas, which is main cause for acid rain, as this reacts with water vapor in atmosphere to form sulfuric acid.