Combining aqueous solutions of BaI2 and Na2SO4 affords a precipitate of BaSO4 . Which ion(s) is/are spectator ions in the reaction?

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Combining aqueous solutions of BaI2 and Na<sub>2</sub>SO<sub>4</sub> affords a precipitate of BaSO<sub>4</sub> . Which ion(s) is/are spectator ions in the reaction?