Write the reaction for a diprotic acid, H2A, to reach the first equivalence poin

Question

Write the reaction for a diprotic acid, H2A, to reach the first equivalence point with NaOH.

Write the reaction for a acid HA-, to reach the second equivalence point with NaOH.

What species would be present at the first halfway point for the titration of a diprotic acid, H2A, with NaOH.  (Hint: look at your answer to question 1 and think about the halfway point).

What species would be present at the second halfway point for the titration of a diprotic acid, H2A, with NaOH. (Hint: look at your answer to question 2 and think about the halfway point).

remember that at the halfway point for each, the hydroxide is limiting.

Explanation / Answer

a) H2A (aq) + NaOH(aq)<---------> NaHA(aq) + H2O(l)

b) NaHA(aq) + NaOH(aq) <---------->Na2A(aq). + H3O+(aq)

c) species at first half way point , H3O+ , Na+ , H2A, HA-

d) Species at second half way point , H3O+ , Na+, HA-, A2-

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