What is the correct balanced formula equation for the reaction between aqueous solutions of sodium sulfate and barium chloride? a) NaSO₄ + BaCl₂ → NaCl + BaSO₄ b) Na₂SO₄ + BaCl₂ → 2NaCl + BaSO₄ c) NaSO₄ + 2BaCl₂ → 2NaCl + BaSO₄ d) 2NaCl + BaSO₄ → Na₂SO₄ + BaCl₂