To perform vacuum filtration, we will be using a bookener funnel and filter flask. This technique allows us to separate solids from solutions. First, clamp the flask to a ring stand. This will prevent the vacuum hose from tipping over the filtration setup. Place the neoprene seal in the mouth of the flask, then place the funnel loosely in the seal. Place a piece of filter paper in the top of the funnel. Attach the vacuum hose to the flask. Turn the vacuum on using the other knob, then wet the filter paper with a suitable solvent. This is referred to as seeding the filter paper. This step is essential as it will position the filter paper flush to the funnel, preventing loss of the solid. Once the filter is seeded, slowly pour your solution into the funnel. The solid has been separated from the solution, disconnect the vacuum hose first, and then turn off the vacuum valve. This prevents solution from backwashing into the vacuum system. To recover the solid, invert the bookener funnel over a watch glass, and remove the filter paper from the funnel using a spatula. Dry the solid in the oven, located in the equipment room.