Problem: 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?

FREE Expert Solution

pH at half equivalence point = pKa

  • higher pK→ lower pK→ higher Kb
  • lower pKhigher pKlower Kb
    • pKb = -log(Kb)

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Problem Details

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?

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Our tutors have indicated that to solve this problem you will need to apply the Acid and Base Titration Curves concept. You can view video lessons to learn Acid and Base Titration Curves. Or if you need more Acid and Base Titration Curves practice, you can also practice Acid and Base Titration Curves practice problems.

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