At the equivalence point in an acid-base titration A)the [H ₃O ⁺] equals the K _a of the acid. B)the [H ₃O ⁺] equals the K _a of the indicator. C)the amounts of acid and base which have been combined are in their stoichiometric ratio. D)the pH is 7.0. E)the pH has reached a maximum.

Question

Quizplus · Accepted Answer

At the equivalence point, the moles of acid and moles of base are in their stoichiometric ratio, meaning that all of the acid has reacted with all of the base. This is why the equivalence point is used to determine the unknown concentration of an acid or base in a titration. The pH at the equivalence point can vary depending on the strength of the acid and base being used, so options A, B, D, and E are not always true.

At the Equivalence Point in an Acid-Base Titration