An experiment is designed to determine the mass percent of sulfate in an unknown soluble sulfate salt. Given the following reaction:
BaCl₂ (aq) + Na₂SO₄ (aq) → BaSO₄ (s) + 2 NaCl (aq)
Out of the options below, which reactant should limit formation of products to determine the mass percent of sulfate from a soluble sulfate salt?
A) BaCl₂
B) Na₂SO₄
C) BaSO₄
D) NaCl