Can anybody help me answer this?

Question

You are performing a titration. In the Erlenmeyer flask, you have placed 15mL of H2SO4 and you have also added phenolphthalein indicator. In the burette, you have 0.5mol/L KOH, and you slowly add drops of it to the receiving flask. After 16.7mL, the solution in the flask turns faint pink. Calculate the concentration of the acid in the flask.

Answer 1

From the balanced equation, H₂SO₄ + 2 KOH ---> K₂SO₄ + 2 H₂O, we see that the molar ratio of sulfuric acid to potassium hydroxide is 1:2. Therefore:

(1 n H₂SO₄/2 n KOH) (0.5 n KOH/1 L KOH) (0.0167 L KOH/0.015 L H₂SO₄) = 0.0278 = 0.03 mol/L of H₂SO₄ to 1 sig fig.