Simple extraction involves the mixing of the organic solution with water in a separating funnel. Thorough mixing of the two phases (organic and aqueous) is done, and then the mixture is allowed to settle for sometime until the two phases separate. Then the lower layer can be poured into another flask. This procedure can separate water soluble impurities such as inorganic salts, low molecular weight carboxylic acids, and alcohols. Similarly, extraction can be done with dilute aqueous acids to remove organic bases, and with dilute aqueous bases to remove organic acids.
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