Question

When titrating a weak base with HCl at 25°C, the

		pH will be less than 7 at the equivalence point.
		titration will require more moles of base than acid to reach the equivalence point.
		pH will be equal to 7 at the equivalence point.
		titration will require more moles of acid than base to reach the equivalence point.
		pH will be greater than 7 at the equivalence point.

Answer 1

When titrating a weak base with HCl at 25°C, the

pH will be less than 7 at the equivalence point.

In the case of titrating the acid into the base for a strong acid-weak base titration, the pH of the base will ordinarily start high and drop rapidly with the additions of acid. As the equivalence point is approached, it changes from its basic to its acidic color. In strong acid-weak base titrations, the pH at the equivalence point is not 7 but below it. This is due to the production of a conjugate acid during the titration; it will react with water to produce (H3O+) ions.