anhydrous sodium sulfite sodium sulfite Application: medicine, papermaking, tannage, leather, printing, dyeing, bleachin sodium sulfiteMolecular Formula: Na2SO3Molecular Weight: 126.04Purity:96%CAS ... moisture will make it oxidized easily to be sodium sulphate. Do not store for a long time. Index NamePremium gradeSodium sulfite ( ... % ≤0.03Free alkali ( as Na2SO3 ) , % ≤0.4 96% Anhydrous Sodium Sulfite