kaliumsulfitt

Kaliumsulfitt, or potassium sulfite, is an inorganic salt with the chemical formula K2SO3. It appears as a white, crystalline solid that is highly hygroscopic and readily soluble in water. In aqueous solution sulfite species exist in equilibrium with bisulfite depending on the pH, and the compound can slowly oxidize in air to potassium sulfate.

Production and properties are typical of sulfite salts. Potassium sulfite can be prepared by neutralizing sulfurous acid with potassium hydroxide or by other sulfite-forming reactions. It is commonly used as a reducing agent and antioxidant in various applications, and as a preservative in foods and beverages, including dried fruits and wine, where it helps prevent browning and spoilage. Beyond food, it is used in certain industrial processes, such as textile and paper production, and has historical use in photography and dyeing.

Safety and regulatory notes are important. Some individuals are sensitive to sulfites and may experience asthmatic or allergic-type reactions after exposure, particularly in foods and during inhalation of the powder. Because of these risks, labeling requirements and exposure controls are common in many jurisdictions. In terms of handling, potassium sulfite should be kept away from acids and strong oxidizers; it can irritate the eyes, skin, and respiratory tract. On heating or in contact with acids, it releases sulfur dioxide gas, and exposure should be minimized; store in a cool, dry place in tightly closed containers.