25. The titration curve for 50.00 mL 1.000M disodium ascorbate, $\text{Na}_2\text{As}$, with standard 1.000M HCl is shown below: The pH at point I and III are 11.79 and 4.10, respectively, which of the following would be the pKa1 of the diprotic acid, $\text{H}_2\text{As}$
(A) 4.10
(B) 7.95
(C) 11.79
(D) 12.39
(E) none of these

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