The expected product of the reaction between barium chloride BaCl2 and potassium sulfate K2SO4 is barium sulfate BaSO4 and potassium chloride KCl . This is a double displacement reaction, where the cations and anions of the two reactants switch places to form two new compounds. The balanced chemical equation for this reaction is:BaCl2 aq + K2SO4 aq BaSO4 s + 2 KCl aq