Vacuum Filtration

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Description
Selecting the Proper Equipment
Connecting a Trap
Placing the Paper in the Funnel
Creating a Vacuum
Transferring the Mixture to the Funnel
Washing the Solid
Drying the Solid
Collecting the Solid or Liquid
Related Modules
Gravity Filtration
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Transferring a mixture to the funnel

 

Video. Transferring a mixture to the funnel.

Allow the solid to settle to the bottom of the flask. Decant (carefully pour) the liquid into the center of the funnel, being careful not to let the level of liquid rise too high. Using a rubber policeman, transfer the solid from the flask into the funnel. For a quantitative transfer, swirl a small portion (5-10 mL) of an appropriate cold solvent with the solid that remains in the original flask and quickly (while the solid is still suspended) transfer this mixture to the filtration funnel. Repeat the addition of small portions of solvent until all of the solid is transferred to the filter. (An appropriate solvent is one that will not dissolve the solid collected in the filter; usually the solvent from which the solid was just separated is appropriate.)