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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Transcribed Image Text:**Question:** Predict the order of elution of a mixture of the following compounds from a column? Briefly explain.
**Compounds:**
1. **Biphenyl:** A structure consisting of two connected benzene rings.
2. **Benzoic Acid:** A benzene ring with a carboxylic acid group (COOH) attached.
3. **Ethyl Benzoate:** A benzene ring with an ester group (COOCH2CH3) attached.
**Analysis:**
In column chromatography, compounds are separated based on their polarity and interaction with the stationary phase. Non-polar compounds typically elute first as they interact less with the polar stationary phase, while polar compounds elute later due to stronger interactions.
**Order of Elution:**
1. **Biphenyl:** This compound is non-polar and will elute first.
2. **Ethyl Benzoate:** An ester, less polar than the acid, will elute second.
3. **Benzoic Acid:** Being the most polar due to the carboxylic acid group, it will elute last.
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