Title: Sodium Metabisulfite
CAS Registry Number: 7681-57-4
CAS Name: Sodium pyrosulfite
Molecular Formula: Na2O5S2
Molecular Weight: 190.11
Percent Composition: Na 24.19%, O 42.08%, S 33.73%
Line Formula: Na2S2O5
Literature References: Crystallizes from cold water with 7H2O.
Properties: White crystals or powder; odor of SO2. Freely sol in water, glycerol; slightly sol in alcohol. The aq soln is acid.
CAUTION: Potential symptoms of overexposure are irritation of eyes, skin and mucous membranes.
See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 284.
Use: Pharmaceutic aid (antioxidant).
