Predict whether the equivalence point of each of the following titrations is below, above, or at pH 7: Pyridine titrated with nitric acid
see below.
In buffer titration, when two acids are used are they equal to, less to, or greater to each other?
below 7
To determine whether the equivalence point of the titration of pyridine with nitric acid is below, above, or at pH 7, we need to consider the acid-base properties of the reactants involved.
Pyridine is a weak base, while nitric acid is a strong acid. During the titration, the acid (nitric acid) reacts with the base (pyridine) to form its conjugate base (pyridinium ion) and the conjugate acid of the base (nitrate ion).
Since pyridine is a weak base, it will not fully dissociate in water, resulting in a solution that is basic. The initial pH will be greater than pH 7.
As the titration progresses, the strong acid (nitric acid) will neutralize the weak base (pyridine). Initially, the pH will decrease as the acid is added until it reaches the equivalence point, where the moles of acid equal the moles of base. At the equivalence point, all of the pyridine will have been converted to pyridinium ion.
Since pyridine is a weak base and nitric acid is a strong acid, the resulting solution will be acidic at the equivalence point. Therefore, the equivalence point will be below pH 7.
In summary, the equivalence point of the titration of pyridine with nitric acid is below pH 7.