A titration reached the equivalence point when 16.1 mL of 0.209 M H₂SO₄ (aq)was added to 12.0 mL of NaOH (aq)of unknown concentration. What is the concentration (M)of this unknown NaOH solution? A)0.561 B)80.8 C)0.280 D)0.140 E)3.21

Question

Quizplus · Accepted Answer

The balanced equation for the reaction is H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O. At the equivalence point, moles of H₂SO₄ = moles of NaOH/2. Moles of H₂SO₄ = 0.209 M * 0.0161 L = 0.003364 mol. Moles of NaOH = 2 * 0.003364 mol = 0.006728 mol. Concentration of NaOH = 0.006728 mol / 0.012 L = 0.561 M.

A Titration Reached the Equivalence Point When 16