
Sodium chlorite is the sodium salt of chlorous acid, with the chemical formula NaClO₂ and a molecular weight of 90.44. It is a white or slightly yellowish-green crystalline powder with mild hygroscopic properties and acts as a strong oxidizing agent. Its key characteristic is the release of chlorine dioxide (ClO₂) under acidic conditions, providing both highly effective bleaching and disinfection capabilities without producing carcinogenic trihalomethanes. It is widely used in the paper, textile, water treatment, food processing, and organic synthesis industries.
| Item | Specification |
| Melting point | 180–200°C (decomposition) |
| Boiling point | ≥100°C/1013hPa |
| Density | 2.5 g/cm³ |
| Water solubility | 39 g/100 mL (17°C) |
| Stability | Stable at room temperature; most stable at pH 10; prone to decomposition upon contact with acids, high temperatures, or organic compounds. |
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