does a reaction occur when an aqueous solution of calcium iodide and sodium sulfate are combined. If a reaction does occur write the net ionic equation.

Yes. Ca²⁺ (aq) + SO₄²⁻ (aq) ⟶ CaSO₄ (s)

Step-by-step explanation:

The possible reaction is

CaI₂ + Na₂SO₄ ⟶ CaSO₄ + 2NaI

To predict a reaction, you must know the solubility rules.

The important ones for this question are

Salts containing Na⁺ are soluble. Thus, NaI is soluble. Most sulfates are soluble, but CaSO₄ is not. Thus, CaSO₄ is a precipitate, and a reaction occurs.

Molecular equation

CaI₂ (aq) + Na₂SO₄ (aq) ⟶ CaSO₄ (s) + 2NaI (aq)

Ionic equation

Ca²⁺ (aq) + 2I⁻ (aq) + 2Na²⁺ (aq) + SO₄²⁻ (aq) ⟶ CaSO₄ (s) + 2Na⁺ (aq) + 2I⁻ (aq)

Net ionic equation

Cancel all ions that appear on both sides of the reaction arrow (underlined).

Ca²⁺ (aq) + 2I⁻ (aq) + 2Na²⁺ (aq) + SO₄²⁻ (aq) ⟶ CaSO₄ (s) + 2Na⁺ (aq) + 2I⁻ (aq)

The net ionic equation is

Ca²⁺ (aq) + SO₄²⁻ (aq) ⟶ CaSO₄ (s)