... ; disodium salt; exsiccated sodium sulfiteMolecular Formula:Na2SO3Molecular Weight:126.04 CAS No. : 7757-83-7Property: White crystal powder, Specific gravity: 2.633 ... making, chemical fiber, film, photographing, food, etc. Anhydrous Sodium Sulphite( Cas No.:7757-83-7)96%,97%,98%