Question

18.0 mL of 0.123 M diprotic acid (H2A) was titrated with 0.1020 M KOH. The acid ionization constants for the acid are Ka1=5.2×10−5 and Ka2=3.4×10−10.

At what added volume of base does the first equivalence point occur?

At what added volume of base does the second equivalence point occur?

Answer 1

So in order to get first equivalence point , required volume = 21.705 mL and to get second equivalnce point required volume = 21.705+21.705 = 43.411 mL.