SODIUM METABISULPHITE Extra Pure
SODIUM METABISULPHITE Extra Pure
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Short Name: SODIUM METABISULPHITE
Other Names: Sodium pyrosulfite, Sodium disulfite
Confirming to BP, USP
Chemical Specifications
Appearance : White crystalline powder
Assay (iodometric) : 96.5 - 100%
Assay (as SO2; iodometric) : 65 - 67.4%
Identity (acc. to pharmacopoeias) : Passes test
pH (5% solution in water) : 3.5 - 5.0
Appearance of solution : Passes test
Insoluble matter in water : Max 0.025%
Residual solvents : Passes test
Chloride (Cl) : Max 0.02%
Thiosulphate (S2O3) : Max 0.05%
Heavy metal (as Pb) : Max 0.002%
Arsenic (As) : Max 0.0004%
Iron (Fe) : Max 0.002%
| Basic | |
| CAS No. | 7681-57-4 |
| Grade | Extra Pure |
| HS Code | 2832.1090 |
| Molecular Formula | Na2S2O5 |
| Molecular Weight | 190.10 |
| Purity | 96.5% |
| Shelf Life | 60 Months |
| Physical Properties | |
| Colour | Colour |
| Density [g/cm3] | Density [g/cm3] |
| Melting point/ Freezing point [°C] | Melting point/ Freezing point [°C] |
| Odour | Odour |
| Partition coefficient Log Pow octanol /water at 20°C | Partition coefficient Log Pow octanol /water at 20°C |
| pH value | pH value |
| Physical state at 20 °C | Physical state at 20 °C |
| Solubility in water [% weight] | Solubility in water [% weight] |
| Safety | |
| Hazardous Statement | H302-H318 |
| Precaution Statement | P280-P305 + P351 + P338 |
| Signal Word | Danger |
| Symbol | GHS05, GHS07 |