CAS Registry Number

CAS 7757-83-7 — Sodium sulfite anhydrous

Sodium sulfite anhydrous is a white, water-soluble powder primarily used as a reducing agent, antioxidant, and preservative in food, pharmaceuticals, and industrial processes like pulp bleaching and wastewater treatment. It prevents oxidation in dried fruits, wines, and processed foods, while also serving as a dechlorinating agent in water systems. This chemical has a CAS number of 7757-83-7, molecular formula Na₂O₃S, and a molecular weight of 126.04 g/mol. It carries no signal word but is labelled with hazard statement EUH031 (contact with acids liberates toxic gas, in this case sulfur dioxide), so it should be kept away from acids; it can be stored at ambient conditions. Molekula supplies sodium sulfite anhydrous from research to bulk quantities with full documentation and ISO 9001:2015 traceability.

Also known as: Disodium sulfite · Natrii sulphis · Natrium sulfurosum · Natriumsulfid · Natriumsulfit · S-WAT · SODIUM SULFITE · Sodium sulphite · Sulftech · Sulfurous acid, disodium salt · Sodium sulphite solution (15%) · Sodium sulphite (10%w/v solution in water)