CAS Number 7681-57-4 is the registry number for Sodium Metabisulfite (Na₂S₂O₅, MW 190.10 g/mol). Irritant (releases SO₂).
| CAS Number | 7681-57-4 |
| Chemical Name | Sodium Metabisulfite |
| Molecular Formula | Na₂S₂O₅ |
| Molecular Weight | 190.10 g/mol |
| Category | Food Grade Chemical |
| Available Grades | 97%/Food grade (E223) |
Sodium pyrosulfite · Sodium disulfite · E223