| Anhydrous sodium
sulphite
Molecular
Formula Na2SO3
Molecular Weight 126.04
CAS No:7757-83-7
Content: ≥70% ,≥65%
Properties White crystalline power, Specific gravity 2.633,
soluble in water and slightly soluble in ethanol. Its solution
is one kind of basic fluid. It is one kind of reductive matter
and can be decomposed in heat.
Uses Mainly used in printing, dyeing, drug, papermaking, chemical
fiber, photo, and food industry, etc.
| Technical index |
High pure |
Industrial
sodium sulphite |
Photographic
grade |
Sodium
sulphite |
Top
grade |
First
grade |
Sodium
sulphite |
| Na2CO3≥ % |
98.0 |
97.0 |
96.0 |
97.0 |
| Fe ≤ % |
0.003 |
0.003 |
0.005 |
0.002
|
| Water insoluble matter ≤ % |
0.01 |
0.02 |
0.03 |
0.05 |
| Free alkali (Na2CO3)
≤ % |
0.001 |
0.1 |
0.4 |
0.15 |
| Sodium sulfate (Na2CO3)
≤ % |
1.2 |
2.5 |
-- |
-- |
| Sodium chloride (NaCl) ≤ % |
0.003 |
0.1 |
-- |
-- |
| Heavy metals (as Pb) ≤ % |
0.001 |
-- |
-- |
0.002
|
| As ≤ % |
0.0001 |
-- |
-- |
-- |
| Sodium thiosulfate ≤% |
0.001 |
-- |
-- |
0.0015
|
| Appearance of solution |
qualified |
-- |
-- |
qualified
|
| Reaction in Tollens' reagent |
qualified |
-- |
-- |
qualified
|
|
