3-(N-Morpholino)-2-hydroxy-propanesulfonic acid (MOPSO) is a common buffer used in biology and biochemistry to maintain solutions near physiological pH. The structure of MOPSO is given below. MOPSO has a pKa value of 6.90. Consider the following solutions made by dissolving MOPSO in water. b. Determine the pH when 0.015 mole of MOPSO is dissolved in 500 mL of distilled water. c. Determine how many milliliters of 0.1 M LiOH must be added to the solution described in part b to make a buffer of pH 7.0.

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3-(N-Morpholino)-2-hydroxy-propanesulfonic acid (MOPSO) is a common buffer used in biology and biochemistry to maintain solutions near physiological pH. The structure of MOPSO is given below. MOPSO has a pKa value of 6.90.

Consider the following solutions made by dissolving MOPSO in water.

b. Determine the pH when 0.015 mole of MOPSO is dissolved in 500 mL of distilled
water.
c. Determine how many milliliters of 0.1 M LiOH must be added to the solution described in part b to make a buffer of pH 7.0.

### Molecular Structure Description

The image depicts the molecular structure of a compound, specifically a chemical formula with a heterocyclic ring and additional functional groups. Below is a detailed description:

#### Heterocyclic Ring
- **Structure**: The cyclic part of the structure is a six-membered ring with alternating single bonds.
- **Atoms**: Composed of five carbon atoms (depicted as vertices without explicit labels) and one oxygen atom replacing one carbon atom.
- **Oxygen (O)**: This atom is part of the ring, suggesting a possible ether linkage related to its chemical properties.

#### Functional Groups Attached to the Ring
- **Nitrogen (N)**: Attached to one of the carbon atoms in the ring, indicating an amine group.
- **Side Chain**: 
  - **-CH₂CH(OH)CH₂SO₃H**: 
    - The chain is attached to the nitrogen atom.
    - **Hydroxyl Group (OH)**: Attached to the second carbon in this chain, indicating the presence of an alcohol group.
    - **Sulfonic Acid Group (SO₃H)**: Attached to the end of the chain, suggesting the molecule has acidic properties.

### Diagram Summary
This chemical structure represents a compound possibly used in reactions where its functional groups play significant roles, such as solubility in water due to the sulfonic acid group and potential reactivity due to the amine and hydroxyl groups. This structure could be relevant in organic chemistry, particularly in the study of heterocycles and functionalized organic molecules.
Transcribed Image Text:### Molecular Structure Description The image depicts the molecular structure of a compound, specifically a chemical formula with a heterocyclic ring and additional functional groups. Below is a detailed description: #### Heterocyclic Ring - **Structure**: The cyclic part of the structure is a six-membered ring with alternating single bonds. - **Atoms**: Composed of five carbon atoms (depicted as vertices without explicit labels) and one oxygen atom replacing one carbon atom. - **Oxygen (O)**: This atom is part of the ring, suggesting a possible ether linkage related to its chemical properties. #### Functional Groups Attached to the Ring - **Nitrogen (N)**: Attached to one of the carbon atoms in the ring, indicating an amine group. - **Side Chain**: - **-CH₂CH(OH)CH₂SO₃H**: - The chain is attached to the nitrogen atom. - **Hydroxyl Group (OH)**: Attached to the second carbon in this chain, indicating the presence of an alcohol group. - **Sulfonic Acid Group (SO₃H)**: Attached to the end of the chain, suggesting the molecule has acidic properties. ### Diagram Summary This chemical structure represents a compound possibly used in reactions where its functional groups play significant roles, such as solubility in water due to the sulfonic acid group and potential reactivity due to the amine and hydroxyl groups. This structure could be relevant in organic chemistry, particularly in the study of heterocycles and functionalized organic molecules.
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