Problem: Consider the titration of 50.0 mL of a 0.100 M solution of the weak base, B with 0.100 M HCl. Which of the following statements is false?a. The pOH when 25 mL of the HCl have been added is equal to the pKb of B.b. The major substance present in solution (other than water) when 50 mL of the HCl have been added is BH+.c. The major substance present in solution (other than water) when 0 mL of the HCl have been added is B.d. The pH when 50 mL of the HCl have been added is equal to 7.e. The major substances present in solution (other than water) when 25 mL of the HCl have been added are B and BH+.
FREE Expert Solution
We're being asked to determine the incorrect statement considering the titration of 50.0 mL of a 0.100 M solution of a weak base, B with 0.100 M HCl.
Analyzing each statement:
a. The pOH when 25 mL of the HCl have been added is equal to the pKb of B.
- According to the Henderson-Hasselbalch equation, pKb will only be equal to pOH when the concentration of weak base is equal to the concentration of the conjugate base
Problem Details
Consider the titration of 50.0 mL of a 0.100 M solution of the weak base, B with 0.100 M HCl. Which of the following statements is false?
a. The pOH when 25 mL of the HCl have been added is equal to the pKb of B.
b. The major substance present in solution (other than water) when 50 mL of the HCl have been added is BH+.
c. The major substance present in solution (other than water) when 0 mL of the HCl have been added is B.
d. The pH when 50 mL of the HCl have been added is equal to 7.
e. The major substances present in solution (other than water) when 25 mL of the HCl have been added are B and BH+.
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Our tutors have indicated that to solve this problem you will need to apply the Weak Base Strong Acid Titrations concept. You can view video lessons to learn Weak Base Strong Acid Titrations. Or if you need more Weak Base Strong Acid Titrations practice, you can also practice Weak Base Strong Acid Titrations practice problems.
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