Equal volumes of 0.1 M HCl and 0.1 M HC₂H₃O₂ are titrated with 0.1 M NaOH. Which of the following would be equal for both titrations? A) the pH at the equivalence point B) the volume of NaOH added to reach the equivalence point C) the initial pH D) the pH at the halfway point E) two of the above

Question

Quizplus · Accepted Answer

At the equivalence point, the moles of acid and base are equal, so the volume of NaOH added to reach the equivalence point will be the same for both titrations. The initial pH will be different for the two titrations because the two solutions have different starting pH values. The pH at the halfway point will also be different for the two titrations because they have different pKa values. The pH at the equivalence point will also be different because the two acids have different strengths and therefore will require different amounts of base to reach equivalence. Therefore, the only choice that would be equal for both titrations is the volume of NaOH added to reach the equivalence point.

Equal Volumes of 0