Reaction Work-up and Product Isolation: Quiz

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A drawback of liquid-liquid extractions is that*

They can be used to effectively separate organic and inorganic species

Multiple extractions may be needed, requiring large volumes of solvent and generating more waste

They can be used to isolate products from high-boiling, dipolar aprotic solvents

Additives, such as acids and bases, can be added to increase aqueous solubility

The most efficient way to isolate solids is by direct drop, a technique in which*

The starting materials are soluble in hot solvent and the product crystallizes upon cooling the reaction mixture

An anti-solvent is added to the reaction solvent to crystallize the product

The solvent is swapped between the reaction medium and the crystallization solvent

A seed crystal is introduced to the reaction mixture to effect crystallization