extraction-091013090754-phpapp01

extraction-091013090754-phpapp01 - Separating Acids and...

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Separating Acids and Neutral Compounds by Solvent Extraction
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Definition Extraction Washing ± Extraction Extraction : ¾ a process that selectively dissolves one or more compounds into an appropriate solvent. The resulting solution is called an extract. ¾ refers to the transfer of these compounds from one liquid solvent to another one. ¾ can be used to separate unwanted impurities or to separate mixtures of compounds. ± The two solvents used for extraction must be immiscible. ± Washing is the removal of impurities from a solvent containing your compound by a second immiscible solvent.
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± Choosing the solvents : ¾ Two immiscible solvents : water vs organic solvent. ¾ Nonpolar hydrocarbons and ethers (polar) are less dense than water, so the water tends to move to the bottom. ¾ Most chlorinated solvents are more dense than water, so the water will be on top. ¾ Like dissolves like (nonpolar compounds are more soluble in nonpolar solvents). ± To confirm the identities of the layers, add one or two drops of water to the funnel: ¾ If water mixes with the top layer, then the top layer is water. ¾ If water falls through the top layer, the bottom layer is water.
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extraction-091013090754-phpapp01 - Separating Acids and...

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