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Experiment 10


-Introduction

-Proper Experimental Technique

-Partition Coefficients and Phase Separation

-Evaluation Question

-Extraction Flowchart



Experiment 10 - The extraction of Caffeine from Cola drinks >> Extraction Flowchart

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Experiment 10 - The extraction of Caffeine from Cola drinks

Extraction Flowchart

The results above show that multiple extractions with smaller volumes are more effective than one extraction with a larger volume of methylene chloride. Clearly, a limit should be drawn somewhere, else the extraction procedure becomes extremely tedious and drawn out. Extracting into equal volumes of a new solvent three times is sufficient for most applications. The flowchart below summarizes the process:

Summary

This tutorial on liquid-liquid extraction has presented the following topics:

  • What experimental goals are best achieved with extractions.
  • How extractions work: differences of solubility in two or more solvents.
  • Proper experimental technique for using a separatory funnel.
  • The number of times that an extraction should be performed.

 

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Last Updated: Monday, June 26th, 2017 @ 07:02:13 pm