When aqueous potassium hydroxide reacts with sulfur dioxide, it undergoes a chemical reaction to form potassium sulfite and water. The balanced chemical equation for this reaction is:

2KOH(aq) + SO2(g) → K2SO3(aq) + H2O(l)

In this reaction, potassium hydroxide acts as a base, while sulfur dioxide acts as an acidic gas. The reaction proceeds via the formation of a salt (potassium sulfite) and water. The products of this reaction are potassium sulfite, which is a white crystalline solid, and water, which is a liquid.