Sodium sulfite is a white odorless powder. Density 2.633 g / cm3. Moderately toxic. Sinks in water and dissolves slowly. Also transported as a heptahydrate Na2SO3.7H2O.
Corrosive
Irritant
⚠️ For information only; not a substitute for the official Safety Data Sheet (SDS).
Sodium sulfite is a white odorless powder. Density 2.633 g / cm3. Moderately toxic. Sinks in water and dissolves slowly. Also transported as a heptahydrate Na2SO3.7H2O.
| Physical Description | Sodium sulfite is a white odorless powder. Density 2.633 g / cm3. Moderately toxic. Sinks in water and dissolves slowly. Also transported as a heptahydrate Na2SO3.7H2O. |
| Color/Form | Small crystals or powder |
| Odor | Odorless |
| Melting Point | Decomposes (NTP, 1992) |
| Boiling Point | Decomposes (NTP, 1992) |
| Density | 2.633 at 59 °F (USCG, 1999) - Denser than water; will sink |
| Solubility | Soluble in 3.2 parts (NTP, 1992) |
| Vapor Pressure | Negligible (NTP, 1992) |
| Refractive Index | Index of refraction: 1.565 (powder), 1.515 (prism) |
| Stability/Shelf Life | It is fairly stable and does not oxidize as readily as hydrated sulfite. |
| IUPAC Name | disodium;sulfite |
| Molecular Formula | Na2O3S |
| Molecular Weight | 126.05 g/mol |
| CAS | 7757-83-7 |
| SMILES | [O-]S(=O)[O-].[Na+].[Na+] |
| InChIKey | GEHJYWRUCIMESM-UHFFFAOYSA-L |
| Catalog No | KC.1910281 |
| Pack sizes | 500GM · 5KG |
⚠️ For information only; not a substitute for the official SDS.