What are the principles behind caffeine being extracted from coffee using the above items?

Chemistry
9th Edition
ISBN:9781133611097
Author:Steven S. Zumdahl
Publisher:Steven S. Zumdahl
Chapter11: Properties Of Solutions
Section: Chapter Questions
Problem 109AE: Patients undergoing an upper gastrointestinal tract laboratory test are typically given an X-ray...
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10g coffee

4g sodium carbonate

40m dichloromethane

160ml distilled water

coffee filter

 What are the principles behind caffeine being extracted from coffee using the above items?

1st sodium carbonate mixed with coffee then brought to a boil for 20min then solution/grinds are filtered. Then solution is added to a separatory funnel with 15ml of dichloromethane and two layers are observed so the bottom layer with DCM contains the caffeine, then this layer is collected in a beaker and dried out using molecular seeds. Then the solvent is brought to a boil with crude caffeine remaining and recystallized using 95% ethanol and brought to a boil again. Then the contents are vaccum filtered and  allowed to dry resulting in 30mg caffeine. 

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