The compound H₂SO₃ is called sulfurous acid.
It consists of two hydrogen atoms (H), one sulfur atom (S), and three oxygen atoms (O). Sulfurous acid is a weak acid that is formed when sulfur dioxide (SO₂) dissolves in water. It’s commonly used as a reducing agent in various chemical processes and can also be found in solutions where it has the ability to form salts known as sulfites.
Though sulfurous acid itself is not very stable in its pure form, its salts (like sodium sulfite, Na₂SO₃) are more commonly encountered in industrial applications.
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