CHM142 Exam 3 Review 2024/2025 With Correct Answers

CHM 142 Exam 3 Review

1. Which of the following statements about titration are ii and iii
TRUE?

i. When a weak base is titrated with a strong acid, the
pH at the equivalence point is 7.00
ii. In the titration of a weak acid with a strong base, at
the half-equivalence point, half of the weak acid has
been neutralized and pH = pKa
iii. When a diprotic acid is titrated, there are two equiv-
alence points
iv. At the equivalence point, equal volumes of acidic so-
lution and basic solution have been brought together

2. Of the following solutions, which has the greatest A
buffering capacity?

A) 0.543 M NH3 and 0.555 M NH4Cl
B) 0.087 M NH3 and 0.088 M NH4Cl
C) 0.234 M NH3 and 0.100 M NH4Cl
D) 0.100 M NH3 and 0.455 M NH4Cl
E) They are all buffer solutions and would all have the
same capacity

3. The molar solubility of ________ is not affected by the B
pH of the solution

A) AlBr3
B) NaNO3
C) KF
D) Na2CO3
E) MnS

4. D
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