The reaction between sodium sulfate (Na₂SO₄) and barium chloride (BaCl₂) is a double displacement reaction, which leads to the formation of barium sulfate (BaSO₄) and sodium chloride (NaCl). The balanced chemical equation for the reaction is:
\[ \text{Na}_2\text{SO}_4 (aq) + \text{BaCl}_2 (aq) \rightarrow \text{BaSO}_4 (s) + 2 \text{NaCl} (aq) \]
In this reaction, barium sulfate (BaSO₄) precipitates out as a solid, while sodium chloride remains in aqueous solution.