Problem: Consider the following curve for the titration of a weak monoprotic acid with a strong base and answer each of the following questions.At what volume of added base does pH = pKa?

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Consider the following curve for the titration of a weak monoprotic acid with a strong base and answer each of the following questions.
A graph of pH versus Volume of base added (mL). At 0 mL of base the pH starts out at about 3 then steadily increases as base is added. At about 30 mL of base added the graph is almost vertical from a pH of about 6 to 12. As more base is added past 30 mL the pH goes back to a steady increase up to 80 mL where the pH is about 13.

At what volume of added base does pH = pKa?

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