Reaction in solution, because sulfurous acid formed by sulfur dioxide dissolved in water is more acidic than carbonic acid, strong acid can react with weak acid salt to obtain strong acid.
1. Sodium carbonate absorbs a small amount of sulfur dioxide: 2Na? CO? +SO? +H? O=2NaHCO? +Na? SO?
2. The amount of substances absorbed by sodium carbonate, etc. Sulfur dioxide: Na? CO? +SO? +H? O=H2O+CO? ↑+Na? SO?
3. Sodium carbonate absorbs excessive sulfur dioxide: Na? CO? +2SO? +H? O=CO? ↑+2NaHSO?
sodium carbonate [497-19-8](Na2CO3) with molecular weight of 15.99. The purity of chemicals is more than 99.5% (mass fraction), which is also called soda ash, but it belongs to salt, not alkali. Also known as soda or alkali ash in international trade. It is an important organic chemical raw material, mainly used in the production of flat glass, glass products and ceramic glaze. It is also widely used in domestic washing, acid neutralization and food processing. Extended data
Liquid sulfur dioxide is relatively stable and inactive. Gaseous sulfur dioxide does not decompose when heated to 2℃. Does not burn, and does not form an explosive mixture with air.
Inorganic compounds such as bromine, boron trichloride, carbon disulfide, phosphorus trichloride, phosphorus oxychloride, iodine chloride and various thionyl chloride compounds can be mixed with liquid sulfur dioxide in any proportion. The solubility of alkali metal halide in liquid sulfur dioxide is according to I->; Br－> The order of cl-decreases. Most metal oxides, sulfides and sulfates are insoluble in liquid sulfur dioxide.
sulfur dioxide is a curved molecule, and its symmetry point group is C2v. The oxidation state of sulfur atom is +4, the formal charge is , and it is surrounded by five electron pairs, so it can be described as a supervalent molecule. From the point of view of molecular orbital theory, it can be considered that most of these valence electrons participate in the formation of S-O bonds.