What is the reaction of sulfur dioxide and sodium hydroxide?

Sulfur dioxide (SO2) and sodium hydroxide (NaOH) react to form sodium sulfite (Na2SO3) and water (H2O) by the following reaction.

SO2 + 2NaOH = Na2SO3 + H2O

Other acidic oxides, such as carbon dioxide (CO2), react similarly with sodium hydroxide.

I hope that this information is helpful to you. I was looking for the same reaction myself, and I thought that I'd share.

See the sodium hydroxide article on en.wikipedia.org for further details.