Overview

Sulfur dioxide (SUL-fur dye-OK-side) is a colorless gas with a sharp, harsh odor similar to that of a burning match. It can act as both an oxidizing agent and a reducing agent. An oxidizing agent is a substance that provides oxygen to other substances or provides electrons to them. A reducing agent removes oxygen from other substances or removes electrons from them. Sulfur dioxide dissolves readily in water, forming sulfurous acid (H₂SO₃), which is readily converted to sulfuric acid (H₂SO₄).

Key Facts

Other Names:

Sulfurous oxide; sulfurous anhydride

Formula:

SO₂

Elements:

Sulfur, oxygen

Compound Type:

Nonmetallic oxide (inorganic)

State:

Gas

Molecular Weight:

64.06 g/mol

Melting Point:

−75.5°C (−104°F)

Boiling Point:

−10.05°C (−13.91°F)

Solubility:

Soluble in water, ethyl alcohol, ether, and chloroform

Sulfur dioxide is a natural component of air. It is produced when trees, brush, and other organic matter burn, and it is...