Sodium Sulfite
Bleaching Agent: Sodium sulfite is widely used in the pulp and paper industry as an effective bleaching component, helping maintain the whiteness and overall quality of finished paper products.
Pharmaceutical Uses: It plays an important role in improving the stability and extending the storage life of pharmaceutical preparations, thus guaranteeing the efficacy and safety of medicines.
Water Treatment Additive: As an oxygen scavenger, sodium sulfite fulfills a key function in various water treatment systems.
Environmental Protection Applications: It is also applied in flue gas desulfurization procedures to help lower sulfur oxide discharges, promoting cleaner and more environmentally friendly industrial production.
Sodium sulfite (Na₂SO₃) is a water-soluble salt formed from sulfurous acid, with inherent bleaching, desulfurization and dechlorination properties, which makes it widely applied across various industries. It acts as a core bleaching component in the pulp and paper manufacturing sector.
Furthermore, it helps maintain the bright look of specific materials. In pharmaceutical preparations, it boosts stability and extends the effective duration of medical products. It also serves as an oxygen scavenger in water treatment systems, participates in flue gas desulfurization processes, and acts as a stabilizing ingredient in photographic developer solutions.
Parameters
| Melting point | 500 °C |
| density | 2.63 |
| bulk density | 1480kg/m3 |
| refractive index | 1,484 |
| storage temp. | Store at +5°C to +30°C. |
| solubility | H2O: 1 M at 20 °C, clear, colorless |
| form | Solid |
| Specific Gravity | 2.633 |
| color | White to slightly yellow |
| Odor | Odorless |
| PH | 9.0-10.5 (25℃, 1M in H2O) |
| PH Range | 9.0 - 10.5 at 126 g/l at 25 °C |
| Water Solubility | 23 g/100 mL (20 ºC) |
| Sensitive | Hygroscopic |
| Merck | 148,682 |
| Stability: | Stable. Incompatible with strong acids. Moisture and air sensitive. |
| CAS DataBase Reference | 7757-83-7(CAS DataBase Reference) |
| NIST Chemistry Reference | sodium sulfite(7757-83-7) |
| EPA Substance Registry System | Sodium sulfite (7757-83-7) |
| Absorption | cut-off at 265nm in H2O at 1M |
Safety Information
| Hazard Codes | Xn |
| Risk Statements | 31-36/37/38-22-40-36/38 |
| Safety Statements | 24/25-36-26-22 |
| WGK Germany | 1 |
| RTECS | WE2150000 |
| F | 3-10 |
| TSCA | Yes |
| HS Code | 28321000 |
| Hazardous Substances Data | 7757-83-7(Hazardous Substances Data) |
| Toxicity | LD50 i.v. in mice: 175 mg/kg, Hoppe, Goble, J. Pharmacol. Exp. Ther. 101, 101 (1951) |
