Sodium Sulfite Properties
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Molecular Formula
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Na2SO3
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Molar Mass
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126.043g/mol
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Appearance
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White solid
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Odor
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Odorless
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Density
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2.633 g/cm3 (anhydrous)
1.561 g/cm3 (heptahydrate)
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Melting Point
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33.4 °C (dehydration of heptahydrate)500 °C (anhydrous)
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Boiling Point
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Decomposes(separate(substances) into constituent elements)
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Solubility in Water
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67.8 g/100 mL (18 °C, heptahydrate)
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Solubility
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Soluble in glycerol, insoluble in ammonia, chlorine
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Acidity (pKa)
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~9 (heptahydrate)
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Refractive index(nD)
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1.565
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Molecular Formula
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Na2 SO3
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Molecule Weight
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126.04
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CAS No.
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7757- 83-7
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HS Code
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28321000
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Identity: White crystal or powder and have smell such as SO2 , it will lose some sulfur dioxide if emerged in air, and create sulfate.
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Uses: Used in leather and medicine, bleach textile and paper, reductant
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Item
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Top Grade
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First Grade
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Qualified Grade
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Sodium Sulfide (Na2SO3) ,%≥
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99.0
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98.0
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97.0
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Water-Insoluble , %≤
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0.005
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0.02
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0.03
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Chloride (Nacl ) ,%≤
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0.004
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0.1
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0.1
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Sulfate (Na2SO4 ) ,%≤
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1.00
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1.5
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2.5
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Fe,%≤
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0.002
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0.003
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0.003
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Heavy metal (Pb) ≤%
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0.001
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0.002
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0.002
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Package
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50 plastic bag or big bag
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