Sodium Hydrogen Sulfite
- 中文名称:亚硫酸氢钠
- CAS:7631-90-5
- UN Code:
- Individual Weight:25kg
- EINECS:231-548-0
- HS Code:
- Purity:99%
Description
White monoclinic crystals or crystalline powder with a slight odour of sulfur dioxide.Aqueous solution is weakly acidic (pH ≈ 4.5).Unstable in air, readily oxidized slowly to sodium sulfate with release of SO₂.Decomposes rapidly in contact with strong acids, producing toxic sulfur dioxide gas.
Physical & Chemical Properties
- Molecular FormulaNaHO3S
- Density:1.34g/cm³g/cm³
- Boiling Point:104℃
- Molecular Weight:104.06g/mol
- Flash Point:
- Melting Point:＜-5℃
Safety, Security & Risk
Chemical Hazards
Upon heating and contact with acids, the substance decomposes to form sulfur oxides.It reacts with acids and strong oxidizing agents.There is a fire risk.The substance is a weak acid.It corrodes metals.
Upon heating and contact with acids, the substance decomposes to form sulfur oxides.It reacts with acids and strong oxidizing agents.There is a fire risk.The substance is a weak acid.It corrodes metals.
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