The figure compares the titration of a monoprotic weak acid with a monoprotic weak base and the titration of a diprotic acid with strong base.

(a) Write the reaction between the weak acid and the weak base and show that the equilibrium constant is 107.78. This large value means that the reaction goes "to completion" after each addition of reagent.
(b) Why does pK2 intersect the upper curve at and the lower curve at 3/2Ve? On the lower curve, at 2Ve? on the lower curve, "PKa" for the acid, BH+

Transcribed Image Text:

12- 0% HA +B 10 PK 3 50 100 150 200 250 0 首(mL)