Which is the common ion when sodium sulfate is added to a solution of barium sulfate? na + ba 2 + so4 2 - ?

The compound sodium sulfate is made of sodium ion and sulfate ion.

The formula can be written as Na₂SO₄.

The cation present in this compound is Na⁺ and the anion is SO₄²⁻.

The compound barium sulfate is made of barium ion and sulfate ion.

The formula can be written as BaSO₄.

This compound contains the cation Ba²⁺ and anion SO₄²⁻.

From the above, we can see that both the compounds have common anion which SO₄²⁻

So, the sulfate, SO₄²⁻ is the common ion when sodium sulfate is added to a solution of barium sulfate

The correct answer is S042-