Question

8. A 25.0 mL sample of an H2SO4 solution is titrated with a 0.186 M NaOH solution. The equivalence point is reached with 12.9 mL of base. The concentration of H2SO4 is ________ M. (Hint: write a balanced chemical equation first!)

Answer 1

0.0480 M

Step-by-step explanation:

The reaction is ...

H₂SO₄ + 2NaOH ⇒ Na₂SO₄ +2H₂O

That is, 2 moles of NaOH react with each mole of H₂SO₄. Then the molarity of the H₂SO₄ is ...

moles/liter = (0.186 M/2)(12.9 mL)/(25.0 mL) ≈ 0.0480 M