Sodium Benzoate CAS#532-32-1
Sodium benzoate, with the molecular formula C₇H₅NaO₂, appears as a white crystalline or granular powder with mild hygroscopicity. It is highly soluble in water (530 g/L at 25°C), soluble in glycerol and methanol, and slightly soluble in ethanol, while insoluble in diethyl ether and chloroform. Its 1M aqueous solution has a pH of 7.0–8.5 and remains stable under ambient con
ditions. The compound is widely used as a food preservative, pharmaceutical additive, cosmetic preservative, and industrial antibacterial agent, and is compatible with most non‑oxidizing formulation components.
Sodium Benzoate Chemical Properties
| Item | Specification |
|---|---|
| Melting point | >300 °C (dec.)(lit.) |
| Density | 1.44 g/cm³ |
| Vapor pressure | 0 Pa at 20°C |
| Flash point | 111.4°C |
| Storage temp | Store at room temperature, dry and sealed |
| Solubility | H₂O: 1 M at 20 °C, clear, colorless; slightly soluble in ethanol |
| Form | Crystalline powder / Granular |
| Color | White to off-white |
| Odor | Odorless or faint benzoin odor |
| PH Range | 7.0–8.5 (1M, H₂O, 25℃) |
| Water Solubility | 530 g/L (25 °C) |
| Sensitive | Hygroscopic |
| LogP | 0.05010 |
| Stability | Stable under normal conditions. Incompatible with strong oxidizing agents, strong acids, and ferric salts. |
| InChIKey | QEXWYHBYCCWHJK‑UHFFFAOYSA‑M |
| CAS DataBase Reference | 532-32-1(CAS DataBase Reference) |
| NIST Chemistry Reference | Sodium benzoate(532-32-1) |
| EPA Substance Registry System | Benzoic acid, sodium salt(532-32-1) |
Safety Information
| Item | Specification |
|---|---|
| Hazard Codes | Xi |
| Risk Statements | 36/37/38 |
| Safety Statements | 26-36-37/39 |
| WGK Germany | 1 |
| RTECS | DH0875000 |
| FEMA | 3025 |
| TSCA | Yes |
| HS Code | 29163100 |
This compound is applied as a preservative in food, beverages, cosmetics, and pharmaceuticals; a lubricant and disintegrant in tablet formulations; a corrosion inhibitor in water treatment; a stabilizer in industrial emulsions; and an auxiliary agent in dye and organic synthesis. It also functions as a buffering agent, flavor regulator, and antimicrobial agent in acidic formulations.
