What is H2SO2? Important knowledge about H2SO2.

  1. H2SO2, also known as sulfurous acid or simply sulfuric acid. Its English name is “sulfurous acid”. The molecular mass of H2SO2 is 82.07 g/mol. This molecule consists of two Hydrogen atoms, one Sulphur atom, and two Oxygen atoms. When it becomes ionic, it turns into HSO3- and SO32-.

  2. H2SO2 is a weak acid in water and does not exist as a liquid or solid under standard conditions. It is colorless and odorless. The pH of H2SO2 ranges from 1 to 3. H2SO2 is easily oxidized, forming H2SO4, also known as sulfuric acid.

  3. H2SO2 participates in many chemical reactions. For instance, it can react with metals such as Na, K, Al to form sulfite salts and H2 gas. It can also react with stronger acids like HCl or H2SO4 to produce salts and H2O. H2SO2 can also react with nonmetals such as Cl2, Br2 to generate HCl, HBr, and H2SO4.

  4. H2SO2 is commonly synthesized in the laboratory from SO2 and H2O. Industrially, it can be prepared by combining SO2 with steam under high pressure.

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