The molecular formula for sodium sulfite is Na2SO3. In the formula, the Na represents sodium, the S represents sulfur and the O represents oxygen. The numbers indicate the number of atoms of each element contained within the compound.
Sodium sulfite has a molar mass of 126.04 grams per mole and is a white, odorless solid. It can be made from a reaction of sodium hydroxide and sulfur dioxide gas. It can also be made through a reaction of sulfur dioxide and sodium carbonate. Sodium sulfite is used industrially for the production of paper and the development of film. It is also used in the production of the explosive TNT.