Final answer:
The solution with the lowest concentration of sulfate ion is 0.1M Al₂(SO₄)₃.
Step-by-step explanation:
The solution with the lowest concentration of sulfate ion is 0.1M Al₂(SO₄)₃.
To determine the concentration of sulfate ion in each solution, we need to consider the dissociation of the respective compounds.
For Al₂(SO₄)₃, we can break it down into 2 moles of Al³+ ions and 3 moles of SO₄²- ions. Since we have a 0.1M concentration, the concentration of sulfate ion is 3 * 0.1M = 0.3M.
For K₂SO₄, we have 2 moles of K⁺ ions and 1 mole of SO₄²- ion. With a 0.4M concentration, the concentration of sulfate ion is 0.4M.
Therefore, the solution with the lowest concentration of sulfate ion is 0.1M Al₂(SO₄)₃.