A 0.5 M solution of H₂SO₄ (dilute) is mixed with 300 mL of distilled water. The concentration of H⁺ ions in the new solution is (Assume complete ionization):
Correct: D
Dilution formula: M1V1 = M2V2. Original moles of H₂SO₄ = 0.5 M × 0.2 L = 0.1 mol. After diluting to 500 mL, M2 = (0.1 mol)/(0.5 L) = 0.2 M H₂SO₄. Since H₂SO₄ ionizes to produce 2 H⁺ ions per formula unit, [H⁺] = 0.2 × 2 = 0.4 M.