CHEM 143A Lecture Notes - Lecture 4: Adsorption, Elution, Capillary Action
1 Apr 2019
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Document Summary
Mixed melting point is confirmation but data is melting point. They are too similar to separate using the techniques from experiment 2 and 3. Surface tension can pull up liquid in small spaces. Force that increases with size is london dispersion. Solvent/mobile phase (eluent) it elutes compound off the adsorbent. Polar compound wants to stick to stationary phase so nonpolar compound will move faster than polar compound week 4 page 1 polar compound. If the solvent is more polar, nonpolar compound is not affected. But the polar compound has attraction to both mobile and stationary phase now. Polar compound goes faster and so does nonpolar. Now solvent interacts with stationary phase too since they are both polar. But you can change the polarity of the solvent. Not generally useful for organic compounds since they are not usually soluble in water. Benzene ( make is less carcinogenic as toluene ) Use si gel on plastic or aluminum plate.
