What happens when aqueous solution of BaCl2 is added to aqueous solution of Na2SO3?

When an aqueous solution of BaCl₂ is added to an aqueous solution of Na₂SO₃, a double displacement reaction occurs, resulting in the formation of barium sulfite (BaSO₃), which is insoluble in water and precipitates out of the solution. The balanced chemical equation for this reaction is: BaCl₂ + Na₂SO₃ → BaSO₃ (s) + 2 NaCl. The precipitation of BaSO₃ indicates that a solid product is formed, while NaCl remains dissolved in the solution.