Question

6. A 25.00mL sample of an H2SO4 solution of unknown concentration requires 24.16mL of 0.106M sodium hydroxide for complete neutralization (to reach the equivalence point). What was the concentration of the H2SO4 solution?

Answer 1

Balanced chemical reaction equation is:

H₂SO₄ (aq) + 2NaOH (aq) ==> 2H₂O (l) + Na₂SO₄ (aq)

1 mol acid requires 2 mol base

moles base = 24.16 mL x 10^-3 L x 0.106 M = 0.00256096 moles

moles acid required = 0.00256096 / 2 = 0.00128048 moles

volume of acid = 25 mL = 0.025 L

concentration = moles / liter = 0.00128048 moles / 0.025 L = 0.0512192 M

concentration of the H₂SO₄ solution = 0.05122 M

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