The net ionic equation for the reaction between barium chloride (BaCl₂) and sodium sulfate (Na₂SO₄) is:
Ba²⁺(aq) + SO₄²⁻(aq) → BaSO₄(s)
This shows the formation of the barium sulfate precipitate (BaSO₄), which is the driving force behind this double replacement reaction. The sodium ions (Na⁺) and chloride ions (Cl⁻) are spectator ions and do not appear in the net ionic equation.