When a weak acid is titrated with a weak base, the pH at the equivalence point A)is greater than 7.0. B)is equal to 7.0. C)is less than 7.0. D)is determined by the sizes of K _a and K _b. E)is no longer affected by addition of base.

Question

Quizplus · Accepted Answer

When a weak acid is titrated with a weak base, the pH at the equivalence point is determined by the relative values of K _a and K _b, the acid and base dissociation constants. The equivalence point occurs when the moles of acid and moles of base are equal, but the pH will not necessarily be 7.0 due to the presence of the weak acid and base. The pH at the equivalence point can be calculated using the Henderson-Hasselbalch equation, which takes into account the acid and base dissociation constants as well as the initial concentrations of the acid and base.

When a Weak Acid Is Titrated with a Weak Base