CAS Registry Number

CAS 7775-14-6 — Sodium hydrosulfite

Sodium hydrosulfite (Na₂S₂O₄) is a powerful reducing agent widely used in photography, textile dyeing, and wastewater treatment to decolorize and neutralize oxidizing agents. It’s also employed in food processing as a preservative (E223) and in chemical synthesis. CAS 7775-14-6, molecular formula Na₂S₂O₄, molecular weight 174.11 g/mol. Store at 2–8°C under dry conditions. Signal word: *Danger*—irritant, may cause skin and eye irritation; avoid moisture exposure. Molekula supplies sodium hydrosulfite from research to bulk quantities with full documentation and ISO 9001:2015 traceability.

Also known as: Sodium dithionite