Question Detail
Question
A 25.5 mL aliquot of HCl(aq) of unknown concentration was titrated with 51.2 mL of 0.113 M NaOH(aq) to the end point. What is the concentration of the HCl solution?
Correct Answer
Option D is the correct answer.
Detailed Explanation
HCl + NaOH → NaCl + H₂O (1:1 ratio). Moles NaOH = 0.0512 L × 0.113 M = 0.0057856 mol. Moles HCl = same. Concentration HCl = 0.0057856 mol / 0.0255 L = 0.2269 M ≈ 0.227 M.
Hint
Use M₁V₁ = M₂V₂ for monoprotic acid-base titrations.