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Sodium Sulfite, Sodium Sulfide, Sodium Sulphite manufacturer / supplier in China, offering Sodium Sulfite Anhydrous 96% (CAS No.: 7757-83-7), Hot Sale High Quality Spirulina, Bp/USP/E211 Preservatives Sodium Benzoate/Powder Sodium Benzoate/Sodium Benzoate and so on.

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Sodium Sulfite Anhydrous 96% (CAS No.: 7757-83-7)

FOB Price: Get Latest Price
Min. Order: 1 Ton
Port: Tianjin, China
Production Capacity: 2000tons
Payment Terms: L/C, T/T, D/P, Western Union, Paypal, Money Gram
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Basic Info
  • Model NO.: Sodium Sulfide
  • Classification: S
  • Type: Sodium Sulfide
  • Colour: White
  • Density: 2.633 g/cm3 (Anhydrous)
  • Solubility: Soluble in Glycerol
  • Specific Gravity: 2.63 (Water = 1)
  • Transport Package: 25kg/Bag /1200kgs/Jumbo Bag
  • Origin: China
  • Appearance: Powder, Solid Crystalline Powder
  • Purity: 90%~99%
  • Grade Standard: Industrial Grade
  • Molecular Weight: 126.04
  • Water Solubility: 67.8 G/100 Ml
  • Odor: Sulfurous. Odorless
  • Trademark: OS
  • Specification: Tech Grade
Product Description
Sodium Sulfite Anhydrous 

It has the smell of sulfur dioxide. It can lose some part of sulfur dioxide in the air, at the same time it is oxidated to the sulfate. It can be dissolved about in the water, while can be dissolved slightly in the ethanol, and the water solution shows acidity. Normally, it includes many kinds of the different proportion of Sodium metabisulfite.

It can be used as the deoxidizer and decolourant in the printing and dyeing industry. It can be used as developer in the sensitization industry.
It can be used the reducing agent in the organic industry. It can be used as stabilization agent of the synthetic fiber in the weave industry. It also can be used in the medicament industry, the paper-making, the electron and the water treatment.
Appearance: White crystallites powder
Sodium Sulfite Anhydrous 96% (CAS No.: 7757-83-7)

Sodium Sulfite Properties
Molecular formulaNa 2 SO 3
Molar mass126.043 g/mol
Appearancewhite solid
Density2.633 g/cm 3  (anhydrous)
1.561 g/cm 3  (heptahydrate)
Melting point33.4 °C (dehydration of heptahydrate)
500 °C (anhydrous)
Boiling pointDecomposes(separate (substances) into constituent elements)
Solubility  in water67.8 g/100 mL (18 °C, heptahydrate)
Solubilitysoluble in  glycerol
insoluble in  ammonia , chlorine
Acidity  (p K a )~9 (heptahydrate)
Refractive index ( n D )1.565

Sodium Sulfite  Specification

Molecular Formula
Na 2  SO 3Molecule Weight126.04
CAS No.7757- 83-7HS Code28321000
Identity:White crystal or powder and have smell such as SO 2  , it will lose some sulfur dioxide if emerged in air, and create sulfate.
Uses:Used in leather and medicine, bleach textile and paper, reductant
ItemTop gradeFirst gradeQualified grade
Sodium sulfide 
(Na 2 SO 3 ) ,%≥
Water-Insoluble , %≤0.0050.020.03
Chloride (Nacl ) ,%≤0.0040.10.1
Sulfate (Na 2 SO 4  ) ,%≤
Heavy metal (Pb) ≤%0.0010.0020.002
Package25 plastic bag or big bag(FIBC)
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