Suppose instead of titrating a weak acid with a strong base

Suppose instead of titrating a weak acid with a strong base (as you did in lab), you titrated a weak base with a strong acid. What would the initial pH be? With the titration described above (weak base/strong acid), what would the pH be at the equivalence point? Explain your answer on the previous question about the pH at the equivalence point for a weak base/strong acid titration.

Solution

The initial pH would be that of the weak base, around 10-11.

In cases of strong acid/weak base titration, the acid is added to the solution of weak base. So the pH drops rapidly with the addition of each drop of acid. The pH of the eqivalence point will be below 7, due to the production of the conjugate acid during tritaion, which will react with water to produce hydronium ions, H3O⁺ during titration.