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
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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+.