2. A 100.0-mL sample of the triprotic weak acid H3A (0.200 M) is titrated with 0.200 M NaOH. Besides water and sodium ions, what are the major species after 180.0 mL of 0.200 M NaOH is added in the titration?
(A)H2A-
(B)HA2-
(C)HA2-, A3-
(D)H2A-, HA2-
(E)A3-

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