Sodium metabisulphite (Sodium Bisulfite) is white monoclinic crystalline powder with sulfur dioxide odor; relative density: 1.48; very easily soluble in water; can be decomposed when heated; slightly soluble in ethanol; aqueous solution is acidic; has strong reducing property; can be oxidized in the air or loose sulfur dioxide.
| Appearance | White or light yellow powder |
| NaHSO3,% | 99.00 |
| Water insoluble,% | 0.03 |
| Fe,% | 0.003 |
| As,% | 0.0002 |
| Pb,% | 0.001 |
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