Chemistry
10th Edition
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
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question
Identify the unknown drug and explain in detail.
My unknown number is 5.
Please explain in detail why it is No-doz.
Transcribed Image Text:**Analysis of Thin Layer Chromatography (TLC) Results**
This table presents the comparative analysis between a known mixture and an unknown sample (#5), based on their Retention Factor (Rf) values.
| **Known Mixture** | **Rf Value (Calculated from Table 1)** | **Unknown # 5** | **Rf Value** | **Possible Ingredients in the Unknown** |
|---------------------------|---------------------------------------|-----------------|--------------|-----------------------------------------|
| **Spot 1** | 0.58 | **Spot 1** | 0.077 | Caffeine |
| **Spot 2** | 0.35 | **Spot 2** | N/A | N/A |
| **Spot 3** | 0.077 | **Spot 3** | N/A | N/A |
| **Spot 4** | 0.67 | **Spot 4** | N/A | N/A |
### Description:
- **Known Mixture:**
- Spot 1: The Rf value is 0.58.
- Spot 2: The Rf value is 0.35.
- Spot 3: The Rf value is 0.077.
- Spot 4: The Rf value is 0.67.
- **Unknown #5:**
- Spot 1: The Rf value is 0.077, which matches spot 3 of the known mixture, identifying the substance as Caffeine.
- Spot 2, Spot 3, and Spot 4: Rf values are not applicable (N/A), indicating either no match with the known mixture components or absence of detectable spots.
### Analysis:
The table is used to compare Rf values of spots from the unknown sample with those of a known mixture. An identical Rf value between the unknown and known sample indicates the presence of the same substance. In this case, only the first spot of the unknown sample matches a known value, leading to the identification of Caffeine in the unknown sample.
### Graphical Explanation:
The data is presented in tabular form which helps in visual comparison. Each row represents a different spot in both the known mixture and unknown substance, displaying their respective Rf values and possible matches. This facilitates the identification process done in Thin Layer Chromatography (TLC)
![**Appendix A – Commercially Available Analgesics**
This appendix provides a table listing various commercially available analgesics and the active ingredients they contain, categorized by their commercial names.
| No: | Commercial Name | Aspirin | Caffeine | Acetaminophen | Ibuprofen |
|-----|------------------|---------|----------|---------------|-----------|
| 1 | Bayer Aspirin | X | | | |
| 2 | Generic Aspirin | X | | | |
| 3 | Excedrin | X | X | | |
| 4 | Anacin | X | X | | |
| 5 | No-doz | | X | | |
| 6 | Tylenol | | | X | |
| 7 | Motrin | | | | X |
---
**Table 1: Complete this Table**
This table presents the known compounds, their distance traveled in centimeters (cm) during a chromatography experiment, and the corresponding Rf values.
| Known | Distance travelled (cm) | Rf Value |
|------------------|--------------------------|----------|
| Solvent | 5.2 | - |
| Aspirin | 3.0 | 0.58 cm |
| Acetaminophen | 1.8 | 0.35 cm |
| Caffeine | 0.40 | 0.077 cm |
| Ibuprofen | 3.5 | 0.67 cm |
In chromatography, the Rf value (Retardation factor) indicates the relative distance traveled by each component compared to the solvent front. It is calculated as follows:
\[ \text{Rf value} = \frac{\text{Distance travelled by the compound}}{\text{Distance travelled by the solvent}} \]
This experiment helps in identifying and comparing different substances based on their Rf values.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6ac9d050-1fff-4e75-b553-243d63aa5f64%2F47baebdf-765c-4bd1-a60f-8e68d22214c6%2Ftrvgx3_processed.png&w=3840&q=75)
Transcribed Image Text:**Appendix A – Commercially Available Analgesics**
This appendix provides a table listing various commercially available analgesics and the active ingredients they contain, categorized by their commercial names.
| No: | Commercial Name | Aspirin | Caffeine | Acetaminophen | Ibuprofen |
|-----|------------------|---------|----------|---------------|-----------|
| 1 | Bayer Aspirin | X | | | |
| 2 | Generic Aspirin | X | | | |
| 3 | Excedrin | X | X | | |
| 4 | Anacin | X | X | | |
| 5 | No-doz | | X | | |
| 6 | Tylenol | | | X | |
| 7 | Motrin | | | | X |
---
**Table 1: Complete this Table**
This table presents the known compounds, their distance traveled in centimeters (cm) during a chromatography experiment, and the corresponding Rf values.
| Known | Distance travelled (cm) | Rf Value |
|------------------|--------------------------|----------|
| Solvent | 5.2 | - |
| Aspirin | 3.0 | 0.58 cm |
| Acetaminophen | 1.8 | 0.35 cm |
| Caffeine | 0.40 | 0.077 cm |
| Ibuprofen | 3.5 | 0.67 cm |
In chromatography, the Rf value (Retardation factor) indicates the relative distance traveled by each component compared to the solvent front. It is calculated as follows:
\[ \text{Rf value} = \frac{\text{Distance travelled by the compound}}{\text{Distance travelled by the solvent}} \]
This experiment helps in identifying and comparing different substances based on their Rf values.
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