Sodium sulfite, represented by the chemical formula Na2SO3, is an inorganic compound composed of sodium, sulfur, and oxygen. It appears as a white crystalline solid and is highly soluble in water. Sodium sulfite is commonly used as a preservative in food and beverages, as well as in various industrial applications, including water treatment and photography. In addition to its preservative properties, Na2SO3 acts as a reducing agent in chemical reactions. It can help prevent oxidation, making it useful in processes such as the production of sodium bisulfite and in the pulp and paper industry for bleaching purposes.