Why is suction filtration preferred to gravity filtration

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But compare with gravity filtration, it is much faster in the result of the solvent and air being forced through the filter paper by the application of reduced pressure. Any solvent which boils at about degrees or lower will boil off under the reduced pressure in the vacuum flask. Filtration under vacuum using a Buchner funnel is used when you want to isolate the precipitate the solid for further work or analysis.

All of this apparatus is available together in a basic vacuum filtration kit — this saves you finding parts that will fit together and is a good option for starting out in vacuum filtering. Gravity filtration is the method of choice to remove solid impurities from an organic liquid. The impurity can be a drying agent or an undesired side product or leftover reactant. Gravity filtration can be used to collect solid product, although generally vacuum filtration is used for this purpose because it is faster.

Hot filtrations require fluted filter paper and careful attention to the procedure to keep the apparatus warm but covered so that solvent does not evaporate. The " filtrate " refers to the liquid that has passed through a filter paper as indicated in Figure 1. Gravity filtration is typically used when the filtrate is retained, while suction filtration is used when the solid is retained.

Gravity filtration is preferred when the filtrate is retained as suction has the potential of pulling small solid particles through the filter paper pores, potentially producing a filtrate contaminated with the solid compound.