If you think carefully about what happens during the course of aweak acid–strong base titration, you can learn some very interestingthings. For example, let’s look back at Figure 17.9 and pretendyou did not know that acetic acid was the acid being titrated. Youcan figure out the pKa of a weak acid just by thinking about thedefinition of Ka and looking at the right place on the titrationcurve! Which of the following choices is the best way to do this? (a) At the equivalence point, pH = pKa. (b) Halfway to theequivalence point, pH = pKa. (c) Before any base is added,pH = pKa. (d) At the top of the graph with excess base added,pH = pKa.

Chemistry
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ISBN:9781133611097
Author:Steven S. Zumdahl
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Chapter15: Acid-base Equilibria
Section: Chapter Questions
Problem 5RQ: Draw the general titration curve for a strong acid titrated by a strong base. At the various points...
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If you think carefully about what happens during the course of a
weak acid–strong base titration, you can learn some very interesting
things. For example, let’s look back at Figure 17.9 and pretend
you did not know that acetic acid was the acid being titrated. You
can figure out the pKa of a weak acid just by thinking about the
definition of Ka and looking at the right place on the titration
curve! Which of the following choices is the best way to do this?

(a) At the equivalence point, pH = pKa. (b) Halfway to the
equivalence point, pH = pKa. (c) Before any base is added,
pH = pKa. (d) At the top of the graph with excess base added,
pH = pKa.

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