Which of the following titrations would produce a pH equal to 7.0 at the equivalence point?
I. Titrating NH₃ with standard HCl (delivered from the burette)
II. Titrating HCl with standard NaOH (delivered from the burette)
III. Titrating CH₃COOH with standard NaOH (delivered from the burette)

Question

Quizplus · Accepted Answer

At the equivalence point of a titration between HCl and NaOH, the pH will be 7.0 because the reaction produces a neutral salt, NaCl, and water. In titration I, NH₃ is a weak base, so the pH at the equivalence point will be greater than 7.0. In titration III, CH₃COOH is a weak acid, so the pH at the equivalence point will be less than 7.0. Thus, only titration II will produce a pH of 7.0 at the equivalence point.

Which of the Following Titrations Would Produce a PH Equal