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Sodium Sulphite
CAS No.: 7757-83-7
Molecular Formula: Na2SO3
M.W.: 126.04
Melting point: 150ºC
Description: white crystal powder or granule, taste salt and with sulphur odor. Easily soluble in water, slightly soluble in ethanol. Very easily oxidize as Sodium Sulphate when open in the air. Decompose when meet inorganic acid and give out the gas of sulfur dioxide.
Specification:
| Item |
superior
|
first grade
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second grade
|
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Na2SO3
|
97.0% min
|
96.0% min
|
93.0% min
|
|
Na2SO4
|
2.5% max
|
-
|
-
|
|
Fe
|
0.003% max
|
0.005% max
|
0.01% max
|
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Water insoluble
|
0.02% max
|
0.03% max
|
0.05% max
|
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Free alkali
(as Na2CO3)
|
0.10% max
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0.40% max
|
0.60% max
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|
Heavy metals(as Pb )
|
0.002% max
|
-
|
-
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As
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0.0002% max
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-
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-
|
Uses: This product is mainly used for producing photographic developer, anticorrosive agent for food, bleaching agent for medicinal herbs,etc. And is also used for producing sodium thiosulphate.
Packing : in 25 kg net plastic woven bag.
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