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If a diprotic acid is titrated with a strong base, what is the pH at the second equivalence point?
Below 7
7
Above 7
Not enough info
Below 7
7
Above 7
Not enough info
If a diprotic acid is titrated with a strong base, what is the pH at the second equivalence point?
Below 7
7
Above 7
Not enough info
If you go to the first equivalence point it would be like you started with a solution of HA-.
If you go to the second equivalent point it would be like starting with all A2-.
Thinking logically, since we start with all A2- in water that would otherwise be neutral, our pH must be >7. A2- will attract protons from the autoionization of water and thus raise the pH above 7. A2- has no acidic protons to donate and is highly unlikely to be an electron acceptor, so it will not act as an acid. >7 must be the answer.