Suppose you perform a titration of a diprotic acid and you determine the following information: pH at first equivalence point: 4.36 pH at second equivalence point: 8.72 pH at first half-equivalence point: 2.61 pH at second half-equivalence point: 6.09 What is pKa2 for this unknown acid?

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.

im not exactly sure but i think its b!

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.