Exhibit 3B a Titration Curve

Exhibit 3B A titration curve.

-Refer to Exhibit 3B. Which points on the graph represent pK's?

A) 1 and 7
B) 2, 4 and 6
C) 3 and 5
D) 2, 3, 4, 5 and 6
E) The pKs cannot be determined without more information.