K2SO3, or potassium sulfite, is an inorganic compound composed of potassium, sulfur, and oxygen. It appears as a white crystalline solid and is soluble in water. This compound is often used in various applications, including as a food preservative and in the production of chemicals. In addition to its uses in food preservation, K2SO3 plays a role in the paper and textile industries. It can act as a reducing agent in chemical processes and is also utilized in photography. Its chemical formula indicates that it contains two potassium ions (K⁺) for every sulfite ion (SO3²⁻).