Draw a structural formula for the major ionic form of the amino acid shown below when in aqueous solution at pH 9.8. O HSCH₂CHCOH + NH3 cysteine • You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • Do not include lone pairs in your answer. They will not be considered in the grading.

Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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1. Draw a structural formula for the major ionic form of the amino acid shown below when in aqueous solution at pH 3.0.

2. Draw a structural formula for the major ionic form of the amino acid shown below when in aqueous solution at pH 9.8.

### Educational Content: Structural Formula of Cysteine at pH 9.8

**Task:**
Draw a structural formula for the major ionic form of the amino acid cysteine when in an aqueous solution at pH 9.8.

**Molecular Structure of Cysteine:**
```
  HSCH₂CHCOH
      |
     NH₃⁺
```

At a pH of 9.8, cysteine typically forms a zwitterion, which means it has a positively charged ammonium group (-NH₃⁺) and a negatively charged carboxylate group (-COO⁻).

**Instructions for Drawing:**

- **Disregard Stereochemistry:** You are not required to show the three-dimensional arrangement of atoms.
- **Hydrogen Atoms (H):** It is not necessary to explicitly draw hydrogen atoms unless they are part of a functional group.
- **Lone Pairs:** Do not include lone pairs of electrons in your drawing, as they are not needed for grading.

**Drawing Interface:**
A drawing tool is provided below for your use. Utilize the chemical structure tools to accurately depict the structure of cysteine as per the given conditions.

---

By following these guidelines, you can effectively represent cysteine in its ionic form in an aqueous solution at the specified pH level.
Transcribed Image Text:### Educational Content: Structural Formula of Cysteine at pH 9.8 **Task:** Draw a structural formula for the major ionic form of the amino acid cysteine when in an aqueous solution at pH 9.8. **Molecular Structure of Cysteine:** ``` HSCH₂CHCOH | NH₃⁺ ``` At a pH of 9.8, cysteine typically forms a zwitterion, which means it has a positively charged ammonium group (-NH₃⁺) and a negatively charged carboxylate group (-COO⁻). **Instructions for Drawing:** - **Disregard Stereochemistry:** You are not required to show the three-dimensional arrangement of atoms. - **Hydrogen Atoms (H):** It is not necessary to explicitly draw hydrogen atoms unless they are part of a functional group. - **Lone Pairs:** Do not include lone pairs of electrons in your drawing, as they are not needed for grading. **Drawing Interface:** A drawing tool is provided below for your use. Utilize the chemical structure tools to accurately depict the structure of cysteine as per the given conditions. --- By following these guidelines, you can effectively represent cysteine in its ionic form in an aqueous solution at the specified pH level.
**Title: Structural Formula of Aspartic Acid in Aqueous Solution at pH 3.0**

**Objective:**
Draw a structural formula for the major ionic form of the amino acid, aspartic acid, when in aqueous solution at pH 3.0.

**Chemical Structure:**
- The chemical structure provided is for aspartic acid, which is represented as follows:

  ```
    O
    ||
  HO—C—CH2—CH—COH
         |
       +NH3
  ```

**Instructions:**
- **You do not have to consider stereochemistry.**
- **You do not have to explicitly draw H atoms.**
- **Do not include lone pairs in your answer. They will not be considered in the grading.**

**Tools:**
- A chemical drawing interface is available with various tools for drawing bonds, rings, and more. 

**Diagram Interface:**
- The interface includes tools for drawing structures, with buttons for adding bonds, rings, and functional groups. 

This exercise helps in understanding the behavior of amino acids under different pH levels and highlights the importance of ionic forms in biochemical processes.
Transcribed Image Text:**Title: Structural Formula of Aspartic Acid in Aqueous Solution at pH 3.0** **Objective:** Draw a structural formula for the major ionic form of the amino acid, aspartic acid, when in aqueous solution at pH 3.0. **Chemical Structure:** - The chemical structure provided is for aspartic acid, which is represented as follows: ``` O || HO—C—CH2—CH—COH | +NH3 ``` **Instructions:** - **You do not have to consider stereochemistry.** - **You do not have to explicitly draw H atoms.** - **Do not include lone pairs in your answer. They will not be considered in the grading.** **Tools:** - A chemical drawing interface is available with various tools for drawing bonds, rings, and more. **Diagram Interface:** - The interface includes tools for drawing structures, with buttons for adding bonds, rings, and functional groups. This exercise helps in understanding the behavior of amino acids under different pH levels and highlights the importance of ionic forms in biochemical processes.
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