When titrating a weak base with a monoprotic acid at 25°C,the
A) pH will be 7 at the equivalence point.
B) pH will be greater than 7 at the equivalence point.
C) titration will require more moles of the base than acid to reach the equivalence point.
D) titration will require more moles of acid than base to reach the equivalence point.
E) pH will be less than 7 at the equivalence point.

Question

Quizplus · Accepted Answer

When titrating a weak base with a monoprotic acid, the equivalence point occurs when all of the base has been neutralized by the acid. However, since the weak base is only partially ionized, there will be some unreacted base molecules present in the solution (even at the equivalence point). These unreacted base molecules will hydrolyze water to produce hydroxide ions, which will increase the pH of the solution above 7. Therefore, the pH at the equivalence point of a weak base-strong acid titration will be greater than 7. Choice E is the correct answer.

When Titrating a Weak Base with a Monoprotic Acid at 25°C,the