255556

Sodium metabisulfite

ACS reagent, ≥97.0%

• Synonym(s): Sodium disulfite, Sodium pyrosulfite
• Linear Formula: Na₂S₂O₅
• CAS Number: 7681-57-4
• Molecular Weight: 190.11
• EC Number: 231-673-0
• MDL number: MFCD00167602
• UNSPSC Code: 12352302
• PubChem Substance ID: 24855463
• grade: ACS reagent
• form: chunks; crystalline powder; powder, crystals or granules

Properties

• grade: ACS reagent
• Assay: ≥97.0%
• form: chunks; crystalline powder; powder, crystals or granules
• impurities: ≤0.005% insolubles
• pH: 4.5 (20 °C, 50 g/L)
• mp: >300 °C (lit.)
• anion traces: chloride (Cl^-): ≤0.05%; thiosulfate (S₂O₃^2-): ≤0.05%
• cation traces: Fe: ≤0.002%; heavy metals (as Pb): ≤0.001%
• SMILES string: [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O
• InChI: 1S/2Na.H2O5S2/c;;1-6(2)7(3,4)5/h;;(H,1,2)(H,3,4,5)/q2*+1;/p-2
• InChI key: HRZFUMHJMZEROT-UHFFFAOYSA-L

Description

Other Notes

A -D suffix exists for administrative purposes only.
All -D packages are 100% the same product, same quality, same specification as the package sizes previously sold without a -D.

Safety Information

• Pictograms: GHS05,GHS07
• Signal Word: Danger
• Hazard Statements: H302,H318
• Precautionary Statements: P264 - P270 - P280 - P301 + P312 - P305 + P351 + P338 - P501
• Hazard Classifications: Acute Tox. 4 Oral - Eye Dam. 1
• Supplementary Hazards: EUH031
• Storage Class Code: 13 - Non Combustible Solids
• WGK: WGK 1
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves