CAS No.: 7757-83-7
Molecular Formula: Na2SO3
Molecular Weight: 126.04
White crystal or powder; no foul. Soluble in water, very slightly soluble in ethanol, almost insoluble in ether. White hexagonal prismatic crystals,soluble in water (when 0°C 12.54g/100ml water; When 80°C 283g/100ml water), in 33.4°C The maximum solubility of about 28% when the aqueous solution is alkaline. Slightly soluble in alcohol, insoluble in liquid chlorine, ammonia. Easily oxidized in air sodium, when the temperature is decomposed into sodium sulfide. To strengthen the reducing agent, reacts with sulfur dioxide,sodium bisulfite, reacted with the acid salt.
Usage: The role of anhydrous sodium sulfite is extensive. In the pharmaceutical industry, paper making, leather tanning and dyeing industries and plant fiber bleaching, food, etc it has a very important role.ln addition anhydrous sodium sulfite is also used in film developing, bleaching agents, printing and dyeing industry as a deoxygenation agent.
Specification:Quality Standard（HG/T 2967-2010）
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Items
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Company Standard
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Top Grade
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Fisrt Grade
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Sodium sulfite(Na2SO3) % ≥
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97.0
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93.0
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Fe % ≤
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0.003
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0.005
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Water insoluble material % ≤
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0.02
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0.03
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Free alkali(Na2SO3) % ≤
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0.10
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0.40
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Na2SO4 % ≤
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2.5
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-
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NaCl % ≤
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0.10
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-
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Packing: External packing is PP woven bag, Internal packing is PE bag, the thickness≥0.05mm. There are "Sodium sulfite" printed on the external packing,with the sign of "Avoid moisture and heat". The trademark is "LIDA CHEMICAL".
Storage & defence: Stored in cool and dry place, avoid moisture and heat. No breakage, No mixed with oxidant and toxic matter. The storage period is 6 month since the production date. It should be transported by clean car, with covering matter, avoid raining.
