Using only the information in the pK table below, write an estimated pK value for each labeled H in the two structures below. For example, if the pK, value of the H labeled a has an estimated value of 50, write 50 in the first box of the answer table and so on. hor :0: H d :0: 0: H b pka 0 b 0 0 0 H a с d X acid CH, 4 NH3 HC=CH II CH CCH3 H₂O || CH,CNH, pK 50 35 25 19 16 15 ? A olo Ar

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**Instructions:**

Using only the information in the pKₐ table below, write an estimated pKₐ value for each labeled H in the two structures below. For example, if the pKₐ value of the H labeled *a* has an estimated value of 50, write 50 in the first box of the answer table and so on.

**Structures:**

- **Structure 1:**
  - Proton labeled *a* attached to a nitrogen.
  - Proton labeled *b* attached to an oxygen within a furan ring.
  
- **Structure 2:**
  - Proton labeled *c* attached to an oxygen connected to a carbon ring.
  - Proton labeled *d* attached to an oxygen at a hydroxyl group.

**Answer Table:**

| H | pKₐ |
|---|-----|
| a |     |
| b |     |
| c |     |
| d |     |

**pKₐ Reference Table:**

| Acid        | pKₐ |
|-------------|-----|
| CH₄         | 50  |
| NH₃         | 35  |
| HC≡CH       | 25  |
| CH₃C≡CH     | 19  |
| H₂O         | 16  |
| CH₃CNH₂     | 15  |

**Task:**

Estimate the pKₐ values based on the protons’ environments in each structure using the reference table provided.
Transcribed Image Text:**Instructions:** Using only the information in the pKₐ table below, write an estimated pKₐ value for each labeled H in the two structures below. For example, if the pKₐ value of the H labeled *a* has an estimated value of 50, write 50 in the first box of the answer table and so on. **Structures:** - **Structure 1:** - Proton labeled *a* attached to a nitrogen. - Proton labeled *b* attached to an oxygen within a furan ring. - **Structure 2:** - Proton labeled *c* attached to an oxygen connected to a carbon ring. - Proton labeled *d* attached to an oxygen at a hydroxyl group. **Answer Table:** | H | pKₐ | |---|-----| | a | | | b | | | c | | | d | | **pKₐ Reference Table:** | Acid | pKₐ | |-------------|-----| | CH₄ | 50 | | NH₃ | 35 | | HC≡CH | 25 | | CH₃C≡CH | 19 | | H₂O | 16 | | CH₃CNH₂ | 15 | **Task:** Estimate the pKₐ values based on the protons’ environments in each structure using the reference table provided.
The image contains a chemical structure diagram on the left, and a table listing chemical species and their pKa values on the right.

**Chemical Structure:**

- The diagram depicts a complex organic molecule. It includes several functional groups and atoms labeled as "H^c," "H^d," and others. The structure has a benzene ring fused with a five-membered nitrogen-containing ring, likely indicating a heterocyclic compound.

**Table of Chemical Species and pKa Values:**

1. **O=C(CH₃)₂** - pKa: 19
2. **H₂O** - pKa: 16
3. **O=C(NH₂)(CH₃)** - pKa: 15
4. **NH₄⁺** - pKa: 9
5. **O=CH₃COH** - pKa: 5
6. **H₃O⁺** - pKa: −2

The pKa values represent the strength of an acid, with lower pKa values indicating a stronger acid. The given values help in understanding the acidity of various chemical species.
Transcribed Image Text:The image contains a chemical structure diagram on the left, and a table listing chemical species and their pKa values on the right. **Chemical Structure:** - The diagram depicts a complex organic molecule. It includes several functional groups and atoms labeled as "H^c," "H^d," and others. The structure has a benzene ring fused with a five-membered nitrogen-containing ring, likely indicating a heterocyclic compound. **Table of Chemical Species and pKa Values:** 1. **O=C(CH₃)₂** - pKa: 19 2. **H₂O** - pKa: 16 3. **O=C(NH₂)(CH₃)** - pKa: 15 4. **NH₄⁺** - pKa: 9 5. **O=CH₃COH** - pKa: 5 6. **H₃O⁺** - pKa: −2 The pKa values represent the strength of an acid, with lower pKa values indicating a stronger acid. The given values help in understanding the acidity of various chemical species.
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