Consider the Following Information About the Diprotic Acid,ascorbic Acid $\times$ 10^-5)
HAs^- As^2- + H⁺ pK_a

question 92

Multiple Choice

Consider the following information about the diprotic acid,ascorbic acid.(H₂As for short,molar mass 176.1)
H₂As HAs^- + H⁺ pK_a
= 4.10 (K_a
= 7.9 $\times$ 10^-5)
HAs^- As^2- + H⁺ pK_a
= 11.79 (K_a
= 1.6 $\times$ 10^-12)
The titration curve for disodium ascorbate,Na₂As,with standard HCl is shown below:
-What major species is (are) present at point III?

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