What is H2SO3? Important knowledge about H2SO3

1. Definition of H₂SO₃:

1.1 Names:

• Common name: H₂SO₃ is called Sulfuric Acid, Sulfurous Acid or Sulfurous Acid.
• English name: H₂SO₃ is called Sulfurous Acid.

1.2 Atomic mass: H₂SO₃ has an atomic mass of 82.

1.3 Molecular structure:
H₂SO₃ is composed of 2 Hydrogen atoms, 1 Sulfur atom and 3 Oxygen atoms.

1.4 Ion structure:
When dissociated, H₂SO₃ produces 2 Hydrogen ions (H+) and 1 Sulfur ion (SO₃^2-).

2. Properties of H₂SO₃:

2.1 Physical properties of H₂SO₃:

• State: gaseous
• Color: colorless
• Odor: quite distinctive, quite pungent
• pH: ranges from 1-3, it is a strong acid.

2.2 Chemical properties of H₂SO₃:
H₂SO₃ has oxidizing and reducing properties, can react with metals, non-metals and salts.

3. Common chemical reactions of H₂SO₃:
   Depending on the reacting substance, H₂SO₃ can produce various reactions.

4. Preparation of H₂SO₃:

4.1 Laboratory preparation of H₂SO₃:
H₂SO₃ can be prepared by reacting sulfur dioxide with water.

4.2 Industrial preparation of H₂SO₃:
H₂SO₃ is prepared from the oxidation of sulfur present in sulfide ores, then reacted with water to produce H₂SO₃.