When a diprotic acid is titrated with a strong base,and the K_a1 and K_a2 are significantly different,then the pH vs.volume plot of the titration will have A) a pH of 7 at the equivalence point. B) two equivalence points below 7. C) no equivalence point. D) one equivalence point. E) two distinct equivalence points.

Question

Quizplus · Accepted Answer

Since the two dissociation constants are significantly different, the diprotic acid will have two distinct equivalence points. At the first equivalence point, only the first proton will be neutralized, resulting in a pH greater than 7. At the second equivalence point, both protons will be neutralized, resulting in a pH of exactly 7. Therefore, the pH vs. volume plot of the titration will have two distinct equivalence points below pH 7.

When a Diprotic Acid Is Titrated with a Strong Base,and