查看“︁亚硫酸”︁的源代码

{{NoteTA|G1=Chemistry}}
{{Chembox
|   Name = 亚硫酸
|   ImageFile = Sulfurous-acid-2D-pyramidal.png
|   ImageSize = 150px
|   ImageName = 亚硫酸
|   ImageFile1 = Sulfurous-acid-3D-balls.png
|   ImageSize1 = 200px
|   ImageName1 = 亚硫酸的球棍模型
|   ImageFile2 = SO2 solution 1.jpg
|   ImageName2 = 二氧化硫水溶液
|   IUPACName = Sulfurous acid
| Section2 = {{Chembox Properties
|   Formula = “H<sub>2</sub>SO<sub>3</sub>”(aq)
|   MolarMass = 82.07
|   Appearance = 無色水溶液
|   Solubility = 只存在[[水溶液]]中
  }}
}}
'''亚硫酸'''是化学式为“H<sub>2</sub>SO<sub>3</sub>”的[[无机化合物]]，实际上是[[二氧化硫]]的水溶液。真正的亚硫酸分子只在气态有发现，液態的尚未观测到。<ref>{{cite journal | author = D. Sülzle, M. Verhoeven, J. K. Terlouw, H. Schwarz | title = Generation and Characterization of Sulfurous Acid (H<sub>2</sub>SO<sub>3</sub>) and of Its Radical Cation as Stable Species in the Gas Phase | journal = Angew. Chem. Int. Ed. Engl. | volume = 27 | pages = 1533-4 | year = =1988 | doi = 10.1002/anie.198815331}}</ref> 其对应的正盐为[[亚硫酸盐]]，[[酸式盐]]为[[亚硫酸氢盐]]。

根据[[拉曼光谱]]的数据，二氧化硫的水溶液中存在的全部是二氧化硫分子及[[亚硫酸氢根]]离子，与下列平衡有关：
:<math>\rm SO_2 + H_2O \longleftrightarrow HSO_3^{-} + H^{+} </math>（''K''<sub>a</sub> = 1.54 × 10<sup>−2</sup> dm<sup>3</sup> mol<sup>−1</sup>，p''K''<sub>a</sub> = 1.81）

二氧化硫水溶液具有还原性。
<gallery>
File:SO2 solution 2.jpg|經由二氧化硫水溶液漂白前後之橡皮塞
File:SO2 solution 3.jpg|正浸泡在二氧化硫水溶液中的橡皮塞
</gallery>

== 参见 ==
* [[亚硫酸盐]]
* [[亚硫酸氢盐]]
* [[二氧化硫]]

== 参考文献 ==
{{Reflist|}}

==拓展阅读==
* Andreas F. Voegele Mag., Christofer S. Tautermann MMag., Thomas Loerting Dr., ''et al''. [http://onlinelibrary.wiley.com/doi/10.1002/1521-3765(20021216)8:24%3C5644::AID-CHEM5644%3E3.0.CO;2-9/abstract About the Stability of Sulfurous Acid (H<sub>2</sub>SO<sub>3</sub>) and Its Dimer]{{Wayback|url=http://onlinelibrary.wiley.com/doi/10.1002/1521-3765(20021216)8:24%3C5644::AID-CHEM5644%3E3.0.CO;2-9/abstract |date=20161221042152 }}, 2002

{{硫化合物}}
{{无机酸}}
{{Authority control}}
[[Category:无机酸|硫]]
[[Category:四价硫化合物]]
[[Category:亚硫酸盐|*]]
[[Category:亚硫酸氢盐|*]]