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2.2 Conjugate Base-Acid Relationship and pH Scale (Solution)

Lesson Summary

1. Which of the following is the weakest acid?

A. H2S (KA = 1.1 x 10-7)
B. HCO2H (KA = 1.8 x 10-4)
C. HF (KA = 6.8 x 10-4)
D. NH4+ (KA = 5.6 x 10-10)
E. Acetic acid (KA = 1.8 x 10-5)

2. Which of the following molecules would be the strongest acid?

3. Which of the following molecules would be the strongest acid?

4. Of the acids shown in the table below, __________ is the strongest acid.

A. C2H3OH
B. H2C2O4
C. HClO2
D. HCO2H
E. H2C6H6O6

5. Given the KA values in the table, which of the conjugate bases below is the strongest base?

A. C2H3O
B. HC2O4
C. ClO2
D. HCO2
E. HC6H6O6

6. If H2O has a pKA of 15.7 and acetic acid has a pKA of 4.75, which is a stronger base, hydroxide (OH) or acetate (C2H3O2)?

7. Given the KB values in the table, which of the conjugate acids below is the weakest acid?

A. HCO2
B. C5H5NH+
C. NH4+
D. H3NOH+
E. H2S