Which of the following is correct for the equivalence point in an acid-base titration? A) The pH is at its highest value for any reaction. B) The amounts of acid and base combined are in a stoichiometric ratio at the equivalence point in an acid-base titration. C) The pH is 7.0. D) The pH is equal to the pK_a of the weak acid. E) The pH is equal to the pK_b of the weak base.

Question

Quizplus · Accepted Answer

At the equivalence point, the amounts of acid and base combined are in a stoichiometric ratio, meaning all of the acid has been neutralized by the base (or vice versa). This is why it is called the equivalence point. The pH of the solution at the equivalence point depends on the strength of the acid and base being used in the titration, and can be below, above, or equal to 7.0. Therefore, options A, C, D, and E are all incorrect.

Which of the Following Is Correct for the Equivalence Point