Appearance and appearance: white, monoclinic crystal or powder.
CAS:7757-83-7
Melting point (℃) : 150 (water loss decomposition)
Relative density (water =1) : 2.63
Molecular formula: Na2SO3
Molecular Weight: 126.04(252.04)
Solubility: Soluble in water (67.8g /100 mL (seven water, 18 °C), insoluble in ethanol, etc.