Description
Sodium sulfite is a white odorless powder. Density 2.633 g / cm³. Moderately toxic. Sinks in water and dissolves slowly. Also transported as a heptahydrate Na2SO3.7H₂O.;DryPowder; DryPowder, Liquid; Liquid; OtherSolid; PelletsLargeCrystals;White crystalline powder or colourless crystals;WHITE CRYSTALS OR POWDER.
Synonyms
Sodium sulfite anhydrous;SODIUM SULFITE, EXSICCATED;SODIUM SULPHITE;anhydroussodiumsulfite;disodiumsulfite;exsiccatedsodiumsulfite;natriisulphis;natriumsulfid
IUPAC Name
disodium; sulfite
Molecular Weight
126.04
Molecular Formula
Na2O3S
Canonical SMILES
[O-]S(=O)[O-].[Na+].[Na+]
InChI
InChI=1S/2Na.H₂O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2
InChI Key
GEHJYWRUCIMESM-UHFFFAOYSA-L
Boiling Point
Decomposes (NTP, 1992);Decomposes
Melting Point
500°C
Density
2.633
Solubility
Soluble in 3.2 parts (NTP, 1992);In water, 30.7 g/100 g water at 25 °C;Soluble in 3.2 parts water;Soluble in glycerol; very slightly soluble in alcohol;Sparingly soluble in alcohol;Insoluble in ethanol;Insoluble in liquid chlorine, ammonia;Solubility in water, g/100ml at 20 °C: 22 (good)
Appearance
White crystals or powder
Assay
0.99
Autoignition Temperature
Not flammable (USCG, 1999)
Color Form
Small crystals or powder;White hexagonal crystals;White crystals or powder
Complexity
18.8
Covalently-Bonded Unit Count
3
Decomposition
When heated to decomposition it emits very toxic fumes of Na2O /sodium oxide/ and SOx /sulfur oxides/.;600 °C
EC Number
231-821-4
Exact Mass
125.9363
Formal Charge
0
H-Bond Acceptor
4
H-Bond Donor
0
Heavy Atom Count
6
ICSC Number
1200
LogP
-4
MDL Number
MFCD00003503
MeSH Entry Terms
sodium sulfite;sodium sulfite, 35S-labeled cpd;sodium sulfite, heptahydrate;sodium sulphite;sulfurous acid, sodium salt
Monoisotopic Mass
125.9363
Odor
Odorless
Other Experimental
Density: 1.539. MP: decomposes; loses 7 H₂O at 150 °C /Sodium sulfite heptahydrate/;Efflorescent crystals. Unstable, oxidizing in air to sulfate. Soluble in 1.6 parts water, about 30 parts glycerol; sparingly soluble in alcohol. Aqueous solution is alkaline and dissolves sulfur; pH approximately 9 /Sodium sulfite heptahydrate/;Colorless, monoclinic crystals; demsity: 1.56 g/cu cm; solubility: 30.7 g/100 g water at 25 °C; slightly solluble in ethanol; unstable /Sodium sulfite heptahydrate/
Physical State
White crystals or powder
Refractive Index
1.484
Rotatable Bond Count
0
RTECS Number
WE2150000
Stability
Stable. Incompatible with strong acids. Moisture and air sensitive.
UNII
VTK01UQK3G
Vapor Pressure
Negligible (NTP, 1992)
