Explanation:
It is known that in titration of diprotic acid, pH of the half equivalence points represents of acid.
Therefore, = pH of the second half equivalence point = 6.09
Hence, during the titration of a diiprotic acid () with strong base, the following dissociation take place.
( first equivalence point)
(second equivalence point)
The of diprotic acid will be calculated as follows.
pH =
Now, at half equivalence point,
Therefore,
pH =
pH =
Thus, we can conclude that for this unknown acid is equal to its pH.