Question 4 the compound sodium sulfate is soluble in water. when this compound dissolves in water, which ion listed below would be present in solution? s2 - na22 + o2 - so42 - none of the above

Answer is: SO₄²⁻ would be present in solution.

Balanced chemical reaction (dissociation):

Na ₂SO₄ (aq) → 2Na⁺ (aq) + SO₄²⁻ (aq).

The compound sodium sulfate dissociates in water on sodium cations (there are two sodium atoms in one molecule of sodium sulfate), charge charge of + 1 and sulfate ion, charge - 2.