31448
Sodium metabisulfite
puriss. p.a., ACS reagent, reag. Ph. Eur., dry, 98-100.5%
Synonym(s):
Sodium disulfite, Sodium pyrosulfite
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About This Item
Linear Formula:
Na2S2O5
CAS Number:
Molecular Weight:
190.11
NACRES:
NB.24
PubChem Substance ID:
UNSPSC Code:
12352302
EC Number:
231-673-0
MDL number:
Assay:
98-100.5%
Form:
powder
Quality Segment
agency
reag. Ph. Eur.
grade
ACS reagent, puriss. p.a.
assay
98-100.5%
form
powder
quality
dry
impurities
≤0.01% thiosulfate (S2O3)
pH
3.5-5.0 (20 °C, 5%)
mp
>300 °C (lit.)
anion traces
chloride (Cl-): ≤50 mg/kg
cation traces
As: ≤0.5 mg/kg, Ca: ≤50 mg/kg, Cd: ≤50 mg/kg, Co: ≤50 mg/kg, Cu: ≤5 mg/kg, Fe: ≤5 mg/kg, K: ≤100 mg/kg, Ni: ≤50 mg/kg, Pb: ≤5 mg/kg, Zn: ≤10 mg/kg
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
General description
Sodium metabisulfite (MBS, Sodium disulfite) is an inorganic salt. It is the sodium salt of disulphurous (pyrosulfurous) acid. It is widely used in textile dyeing, photography and paper industry. It is also commonly added to various food products and wines as a preservative.
Application
Sodium metabisulfite may be used as an initiator during the cross-linking polymerization of polybutadiene in the cores of the vesicle membranes. It may be added as an antioxidant during the preparation of stock solutions of 6-hydroxydopamine in various studies.
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signalword
Danger
hcodes
Hazard Classifications
Acute Tox. 4 Oral - Eye Dam. 1
supp_hazards
Storage Class
13 - Non Combustible Solids
wgk
WGK 1
flash_point_f
Not applicable
flash_point_c
Not applicable
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