偏重亚硫酸钠 AR，96%
Sodiummetabisulfite
品牌：桔子
产品编号：S24175
CAS号：7681-57-4
分子式：Na2S2O5
分子量：190.11
MDL：MFCD00167602
| 产品名称 : | 偏重亚硫酸钠 |
|---|---|
| 英文名称 : | Sodiummetabisulfite |
| 参考名称 : | 焦亚硫酸钠 |
| 参考英文名称 : | Disodiumdisulphite |
| CAS号 : | 7681-57-4 |
| 分子式 : | Na2S2O5 |
| 分子量 : | 190.11 |
| SMILES : | [O-]S(=O)(S([O-])=O)=O.[Na+].[Na+] |
| MDL NO : | MFCD00167602 |
| PubChem CID : | 656671 |
| InChIKey : | HRZFUMHJMZEROT-UHFFFAOYSA-L |
| 储存条件 : | RT |
| 参考别名 : | 偏重亚硫酸钠 |
实验性质
| 熔点 : | >302 °F (decomposes) |
|---|---|
| 外观 / 形态 : | Dry Powder; Other Solid; Wet Solid; Large Crystals; CBI; Liquid；Sodium metabisulfite appears as a white crystalline or powder solid with a slight sulfur odor. Toxic by inhalation. Strongly irritates skin and tissue. Noncombustible, but may decompose to emit toxic oxide fumes of sulfur and sodium when heated to high temperature. A corrosive acid when mixed with water. Used as a food preservative and as a laboratory reagent.；WHITE POWDER WITH CHARACTERISTIC ODOUR.；White crystals or crystalline powder；White to yellowish crystals or powder with a slight odor of sulfur.；White to yellowish crystals or powder with an odor of sulfur dioxide.；White to yellowish crystals or powder with an odor of sulfur dioxide; [NIOSH] |
| 颜色 / 形态 : | White hexagonal crystals or powder；White to yellowish crystals or powder.；Colorless crystals；White granular or powdered salt |
| 沸点 : | Decomposes；Decomposes (NIOSH, 2024)；decomposes |
| 密度 : | 1.4；1.4 (NIOSH, 2024) - Denser than water; will sink；1.4 @25 °C；2.36 g/cm³；Specific gravity: 1.4 at 25 °C/4 °C |
| 溶解性 : | Freely soluble in water, glycerol; slightly soluble in alcohol；Soluble in ethanol；66.7 g/100 g water at 25 °C；Very soluble in sodium bisulfite；In water, 39.5 wt % at 20 °C; 41.6 wt% at 40 °C; 44.6 wt% at 60 °C ... Fairly soluble in glycerol |
| 热分解说明 : | 150 °C；Decomposes on heating with ultimate formation of sodium sulfate.；Heat (decomposes) (Note: Slowly oxidized to the sulfate on exposure to air & moisture).；When heated to decomposition it emits toxic fumes of /sulfur and sodium oxides/. |
| 气味 : | In the presences of traces of water, it develops an odor of sulfur dioxide |
| pH : | 4,0-5,5 (10 % aqueous solution)；Aqueous solution is acid |
| LogP : | -3.7 |
计算性质
| 极性表面积 (TPSA) : | 125 Ų |
|---|---|
| 氢键供体数 : | 0 |
| 氢键受体数 : | 6 |
| 可旋转键数 : | 0 |
| 精确质量 : | 189.89825401 Da |
| 重原子数 : | 9 |
| 分子复杂度 : | 136 |
资料来源：偏重亚硫酸钠产品资料页；来源页标注 PubChem CID 656671，资料日期 2026-10-11。
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