Consider the Following Information About the Diprotic Acid Ascorbic Acid

Multiple Choice

Consider the following information about the diprotic acid ascorbic acid (H₂As for short, molar mass = 176.1) . The titration curve for disodium ascorbate, Na₂As, with standard HCl is shown below:
-What major species is(are) present at point III?

A) HAs^- only
B) H₂As and H⁺
C) H₂As only
D) As^2- and HAs^-
E) HAs^- and H₂As