Chemistry Practice Problems Acid and Base Titration Curves Practice Problems Solution: Consider the following titration curves for two we...

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Solution: Consider the following titration curves for two weak bases, both titrated with 0.100 M HCl.Which of the two bases has the larger Kb?

Problem

Consider the following titration curves for two weak bases, both titrated with 0.100 M HCl.
A graph labeled (a) of pH versus Volume of acid added (mL). At 0 mL of acid the pH starts out at about 7 then steadily decreases as acid is added. At about 35 mL of acid added the graph rapidly decreases from a pH of about 4 to 2. As more acid is added past 40 mL the pH goes back to a steady decrease down to 100 mL where the pH is about 1.A graph labeled (b) of pH versus Volume of acid added (mL). At 0 mL of acid the pH starts out at about 10 then steadily decreases as acid is added. At about 55 mL of acid added the graph is almost vertical from a pH of about 6 to 3. As more acid is added past 55 mL the pH goes back to a steady decrease down to 100 mL where the pH is about 2.

Which of the two bases has the larger Kb?