natriumsulfitti

Natriumsulfitti, also known as sodium sulfite, is the sodium salt of sulfurous acid with the chemical formula Na₂SO₃. It is a white, crystalline powder that is readily soluble in water. In its anhydrous form, it is odorless, but commercial grades may have a faint sulfurous odor due to partial oxidation to sodium sulfate.

Industrially, natriumsulfitti is produced by bubbling sulfur dioxide through a solution of sodium hydroxide or sodium carbonate. It is a reducing agent and is used in a variety of applications. In photography, it acts as a developing agent and a preservative. It is also employed in water treatment to remove dissolved oxygen, thereby preventing corrosion. In the pulp and paper industry, it is used as a bleaching agent.

Natriumsulfitti finds use as a food additive, designated by the E number E221. In food, it acts as a preservative and antioxidant, preventing spoilage and discoloration, particularly in dried fruits, wines, and processed potatoes. However, individuals sensitive to sulfites may experience allergic reactions, including asthma symptoms, hives, and digestive upset. Due to these sensitivities, products containing sulfites above a certain threshold are required to be labeled.

In chemical synthesis, natriumsulfitti can be used to prepare other sulfur-containing compounds. It also plays a role in the textile industry as a desizing agent and in the production of dyes. Its ability to reduce oxidized substances makes it a versatile chemical in various industrial processes.