Names | |
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Other names
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Identifiers | |
3D model (JSmol)
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ChEBI | |
ChEMBL | |
ECHA InfoCard | 100.028.794 |
EC Number |
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E number | E223 (preservatives) |
PubChem CID
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RTECS number |
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
Na2S2O5 | |
Molar mass | 190.107 g/mol |
Appearance | White to yellow powder |
Odor | Faint SO2 |
Density | 1.48 g/cm3 |
Melting point | 170 °C (338 °F; 443 K) decomposition begins at 150 °C |
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Solubility | Very soluble in glycerol Slightly soluble in ethanol |
Hazards | |
GHS labelling: | |
Danger | |
H302, H318 | |
P264, P270, P280, P301+P312, P305+P351+P338, P310, P330, P501 | |
NFPA 704 (fire diamond) | |
NIOSH (US health exposure limits): | |
PEL (Permissible)
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None[1] |
REL (Recommended)
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TWA 5 mg/m3[1] |
IDLH (Immediate danger)
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N.D.[1] |
Safety data sheet (SDS) | Mallinckrodt MSDS |
Related compounds | |
Other anions
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Sodium sulfite Sodium bisulfite |
Other cations
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Potassium metabisulfite |
Related compounds
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Sodium dithionite Sodium thiosulfate Sodium sulfate |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Sodium metabisulfite or sodium pyrosulfite (IUPAC spelling; Br. E. sodium metabisulphite or sodium pyrosulphite) is an inorganic compound of chemical formula Na2S2O5. The substance is sometimes referred to as disodium metabisulfite. It is used as a disinfectant, antioxidant, and preservative agent.[2] When dissolved in water it forms sodium bisulfite.