Separation of Acid, Base and Neutral Compounds from a Solid Mixture by Liquid-Liquid Extraction

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Issue:

Science

 

Written by:

Guy B

 

Date added:

August 4, 2014

 

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Grade:

A

 

No of pages / words:

6 / 1518

 

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848 times

 

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Essay content:

This creates layers of liquid, which can be separated and then isolated to help to identify compounds. Another important concept to remember in this experiment is that ionic salts are polar and therefore water soluble, and neutral molecules are non-polar and will usually not dissolve in water. The student is given an unknown containing either an acid and a neutral compound or a base and a neutral compound, but since the components are unknown, the student conducts the experiment as if all 3 compounds are present...
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In this particular experiment, the compounds are benzocaine, salicylic acid, and naphthalene. An appropriate organic solvent is used to create the ether phase. Diethyl ether is used because it has low solubility in water but will dissolve the components of the mixture (creating liquid layers), is not acidic or basic, is less dense than water, and can be easily removed by evaporation...
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