Methylamine, CH3-NH₂, is a weak base (pk = 3.36). Which of the following acids is sufficiently strong to protonate methylamine to an extent greater than 50% at 25 C? (pk for each acid is given) a H₂O (15.7) H₂S (7.04) CH3CH₂-OH (-> CH3CH₂-O HIO (10.70) ) (15.9)

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Chapter1: Chemical Foundations
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**Question:**

**Methylamine, CH₃-NH₂, is a weak base (pK_b = 3.36).**

Which of the following acids is sufficiently strong to protonate methylamine to an extent greater than 50% at 25°C? (pK_a for each acid is given)

- HIO (10.70)
- H₂O (15.7)
- H₂S (7.04)
- CH₃CH₂OH (-> CH₃CH₂O⁻) (15.9)

**Reminder:** pK_a + pK_b = 14.00 (25°C)

**Select one:**

- A. H₂S only
- B. HIO and H₂S
- C. H₂O only
- D. H₂S and H₂O
- E. HIO only

**Explanation:**

The question involves determining which acids can protonate methylamine based on their pK_a values. Taking into account the relationship pK_a + pK_b = 14.00, compare the pK_a of each acid to calculate which can effectively protonate the base (methylamine) beyond a 50% extent at the given temperature.
Transcribed Image Text:**Question:** **Methylamine, CH₃-NH₂, is a weak base (pK_b = 3.36).** Which of the following acids is sufficiently strong to protonate methylamine to an extent greater than 50% at 25°C? (pK_a for each acid is given) - HIO (10.70) - H₂O (15.7) - H₂S (7.04) - CH₃CH₂OH (-> CH₃CH₂O⁻) (15.9) **Reminder:** pK_a + pK_b = 14.00 (25°C) **Select one:** - A. H₂S only - B. HIO and H₂S - C. H₂O only - D. H₂S and H₂O - E. HIO only **Explanation:** The question involves determining which acids can protonate methylamine based on their pK_a values. Taking into account the relationship pK_a + pK_b = 14.00, compare the pK_a of each acid to calculate which can effectively protonate the base (methylamine) beyond a 50% extent at the given temperature.
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GIVEN DATA

Methylamine, CH3-NH, , is a weak base (pkb, = 3.36).
 dissociation 50% at 25 C

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