least polar most polar b. You conduct a TLC experiment on this mixture and obtain the TLC plate shown below on the left. Identify all three compounds on the TLC plate less polar solvent more polar solvent

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Chapter1: Chemical Foundations
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Please answer part b

### Transcription for Educational Website:

**Figure: TLC Analysis of a Mixture of Compounds**

#### d. You are given a mixture of three compounds (A, B, C, below).

- **Structures:**
  - **A:** Aromatic compound with a methyl group (CH₃)
  - **B:** Aromatic compound with a hydroxyl group (OH)
  - **C:** Aromatic compound with a methoxy group (OCH₃)

#### a. Rank the three compounds from least to most polar.

- **Polarity Ranking:**
  - A (least polar) → C → B (most polar)

#### b. You conduct a TLC experiment on this mixture and obtain the TLC plate shown below on the left. Identify all three compounds on the TLC plate.

- **TLC Plate Diagram:**
  - **Left Plate:** Three spots indicating the presence of compounds.
  - Compounds are arranged vertically on the plate.

#### c. What would the TLC plate look like if you used a less polar solvent? (draw the three spots on the middle plate)

- **Middle Plate:** 
  - Labeled "less polar solvent."
  - Indicative of reduced movement of the spots compared to the initial plate.

#### d. What would the TLC plate look like if you used a more polar solvent? (draw the three spots on the right plate)

- **Right Plate:** 
  - Labeled "more polar solvent."
  - Suggests increased movement of the spots compared to the initial plate.

#### e. Calculate the Rf value of the middle spot of the first plate. (Use a ruler, show your work below.)

- **Rf Calculation Prompt:** 
  - Requires using a ruler to measure the distance traveled by the middle spot relative to the solvent front on the first plate.

#### f. In what order would the three compounds elute in column chromatography?

- **Elution Order:**
  - First to elute → Last to elute 
  - Depended on polarity and interactions with the stationary phase.

---

**Note:**
Understanding polarity is crucial in determining the movement of compounds on a TLC plate and in predicting their behavior in column chromatography. The relative Rf values can help identify the compounds and their order of elution.
Transcribed Image Text:### Transcription for Educational Website: **Figure: TLC Analysis of a Mixture of Compounds** #### d. You are given a mixture of three compounds (A, B, C, below). - **Structures:** - **A:** Aromatic compound with a methyl group (CH₃) - **B:** Aromatic compound with a hydroxyl group (OH) - **C:** Aromatic compound with a methoxy group (OCH₃) #### a. Rank the three compounds from least to most polar. - **Polarity Ranking:** - A (least polar) → C → B (most polar) #### b. You conduct a TLC experiment on this mixture and obtain the TLC plate shown below on the left. Identify all three compounds on the TLC plate. - **TLC Plate Diagram:** - **Left Plate:** Three spots indicating the presence of compounds. - Compounds are arranged vertically on the plate. #### c. What would the TLC plate look like if you used a less polar solvent? (draw the three spots on the middle plate) - **Middle Plate:** - Labeled "less polar solvent." - Indicative of reduced movement of the spots compared to the initial plate. #### d. What would the TLC plate look like if you used a more polar solvent? (draw the three spots on the right plate) - **Right Plate:** - Labeled "more polar solvent." - Suggests increased movement of the spots compared to the initial plate. #### e. Calculate the Rf value of the middle spot of the first plate. (Use a ruler, show your work below.) - **Rf Calculation Prompt:** - Requires using a ruler to measure the distance traveled by the middle spot relative to the solvent front on the first plate. #### f. In what order would the three compounds elute in column chromatography? - **Elution Order:** - First to elute → Last to elute - Depended on polarity and interactions with the stationary phase. --- **Note:** Understanding polarity is crucial in determining the movement of compounds on a TLC plate and in predicting their behavior in column chromatography. The relative Rf values can help identify the compounds and their order of elution.
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