Sodium Sulfite
ALTERNATIVE NAMES
Disodium Sulfite
TECHNICAL SPECIFICATIONS
CAS
7757-83-7
EC
231-821-4
Food Code
E221
Sodium sulfite is a white crystalline powder with formula Na2SO3 and molecular weight 126.04 g/mol. Density 2.63 g/cm³, decomposes above 100°C; highly soluble in water (up to 220 g/L at 20°C), slightly sulfurous odor. Acts as a reducing agent; produced by reacting sulfur dioxide with sodium carbonate.
Sodium Sulfite
Used as preservative in food, antioxidant in pharmaceuticals, bleaching agent in paper, water treatment for oxygen scavenging, and photography.
Moderately toxic; irritates skin, eyes, respiratory tract; releases SO2 with acids. Avoid oxidizers; use PPE, ventilation.
In 25kg bags or drums; moisten spills before sweeping; rinse containers for recycling.
