Sodium Sulfite CAS#7757-83-7
Excellent bleaching and decolorizing performance – Effectively used in pulp and papermaking to improve whiteness and product appearance.
Strong antioxidant and preservation function – Helps maintain the fresh look and stability of finished products and formulations.
Versatile pharmaceutical additive – Supports the stability and effectiveness of many drug products.
Effective water treatment and environmental application – Works as an oxygen scavenger and is useful in flue gas desulfurization and photographic processing.
Products Description of Sodium Sulfite CAS#7757-83-7
Sodium sulfite (Na₂SO₃), a water-soluble sodium salt of sulfurous acid, exhibits bleaching, desulfurizing, and dechlorinating properties and is widely applied across many industries. It is primarily used in the pulp and paper industry for its effective bleaching performance. It also serves as a valuable additive to help maintain the fresh appearance of finished products. In addition, sodium sulfite is an ingredient in numerous pharmaceutical formulations, where it helps preserve drug efficacy and stability. It is further employed in water treatment as an oxygen scavenger, in flue gas desulfurization, and in the maintenance of 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 |
| 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) |
Product Application of Sodium Sulfite CAS#7757-83-7
Sodium sulfite (CAS#7757-83-7) is an inorganic compound with reducing and alkaline characteristics and is widely applied in many fields. In chemical and industrial applications, it is used for post-bleaching dechlorination in the textile industry, pulping and cooking processes in papermaking, deaeration in water treatment, treatment of chromium-containing wastewater, as well as hair removal and softening in the leather industry. In the food and beverage sector, it serves as a preservative, bleaching agent, and antioxidant for preserved fruits, fruit juices, and other foods, and is also used to regulate fermentation in brewing.
