Suction filtration is a laboratory technique used to separate solids from liquids. It involves using a Büchner funnel and a vacuum source to create suction that pulls the liquid through a filter paper, leaving the solid residue behind. This method is efficient for collecting precipitates formed during chemical reactions. The process begins by placing the filter paper in the funnel and connecting it to the vacuum. Once the liquid mixture is poured into the funnel, the suction quickly draws the liquid through the filter, allowing for rapid separation. This technique is commonly used in chemistry and biology labs for purifying substances.