Filtering a precipitate from a solution

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Filtering a solid out of a liquid is done using filter paper and a filter funnel. The filter funnel is supported by the ring on a ring stand. Lay a clay triangle across the ring, then place the filter funnel into the triangle.

filter paper To prepare the filter paper, fold the paper in half , then fold it in half again. When you look at the open edge of the folded paper you will see four edges of paper. With thumb and finger, catch three of these edges. Squeeze the sides of the folded paper and a cone will form with three thicknesses of paper on one side and one thickness of paper on the other. Place this cone of paper into the filter funnel. Place a "catch container" under the stem of the filter funnel and adjust the height of the ring on the ring stand until the tip of the stem is below the mouth of the container.

Use a wash bottle and wet down the inside of the filter paper. This will help it stick to the funnel. You are now ready to filter. Carefully pour the liquid to be filtered into the mouth of the funnel. Do not let the liquid rise to the top of the filter paper. If any liquid goes over and around the paper, your procedure is ruined. Be patient, it will take time for the liquid to move through the pores of the paper. When all the original liquid has been poured into the funnel, use the wash bottle to rinse any remaining precipitate out of the original container. Do not touch or try to stir the liquid inside the filter paper. The wet paper is easily torn, which will ruin your procedure.

If the objective of your filtration is the solid-free liquid, throw the filter paper and its contents into the trash. If your objective is the solid, carefully remove the filter paper and set it in a secure place to dry.

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