Collecting Crystals in Organic Chemistry: What Funnel to Use?

Explanation:

The type of funnel used to collect crystals or precipitates in organic chemistry for large amounts of crystals is the Buchner funnel. This funnel aids in the physical process of filtration, which separates solids from fluids. The Buchner funnel is designed to work under vacuum, which helps to draw the fluid through a filter paper while the solid crystals are trapped on top, allowing for efficient collection of precipitates.

A separatory funnel is used for liquid-liquid extractions to exploit differences in density and solubility between two immiscible liquids, whereas a volumetric funnel is used primarily for transferring precise volumes of a fluid, particularly during the preparation of solutions. A powder funnel has a wide stem and is typically used for transferring powders into containers with narrow openings. In the context of the question, the Buchner funnel is specifically designed for the task of collecting crystals during filtration.