* Sodium sulfite (Na₂SO₃) contains sulfur in the +4 oxidation state.

* Sodium sulfate (Na₂SO₄) contains sulfur in the +6 oxidation state.

Here's a breakdown:

Sodium Sulfite (Na₂SO₃):

* Structure: It consists of two sodium ions (Na⁺) and one sulfite ion (SO₃²⁻).

* Sulfur oxidation state: +4

* Properties: A white, crystalline solid that is soluble in water. It is a reducing agent, meaning it can donate electrons to other molecules. It is used as a food preservative, antioxidant, and in the paper industry.

Sodium Sulfate (Na₂SO₄):

* Structure: It consists of two sodium ions (Na⁺) and one sulfate ion (SO₄²⁻).

* Sulfur oxidation state: +6

* Properties: A white, crystalline solid that is also soluble in water. It is a common ingredient in detergents and fertilizers.

Key differences:

* Oxidation state of sulfur: Sulfite has sulfur in a lower oxidation state (+4) compared to sulfate (+6).

* Chemical properties: Sulfite is a reducing agent, while sulfate is not.

* Applications: Sulfite has specific uses in food preservation and paper production, while sulfate finds applications in detergents and fertilizers.

In summary: Sodium sulfite and sodium sulfate are both inorganic compounds containing sodium and sulfur, but the difference lies in the oxidation state of sulfur. This difference leads to distinct chemical properties and applications for each compound.