1. The filter paper is folded in half, two times in succession, and folded into a 90° central angle shape.
2. Put the stacked filter paper into three layers on one side and open on the other side to form a funnel.
3. Put the funnel-shaped filter paper into the funnel, the filter paper edge is lower than the funnel edge, pour some water into the funnel mouth, so that the wet filter paper is placed against the inner wall of the funnel, and then the remaining water is poured off and used.
4. The filter paper-filled funnel is placed on a filter funnel holder (e.g., on the ring of the iron stand), and a beaker or test tube that receives the filtrate is placed under the funnel neck and the funnel neck tip is placed against the wall of the receiving container.
5. When injecting the liquid to be filtered into the funnel, hold the liquid beaker on the right and hold the glass rod on the left. The lower end of the glass rod is close to the lower side of the three layers of the funnel, so that the cup mouth is close to the glass rod, and the liquid to be filtered flows out along the mouth of the cup. The slope of the glass rod is inclined to flow into the funnel and flow to the liquid in the funnel. The liquid level cannot exceed the height of the filter paper in the funnel.
6. When the liquid passes through the filter paper and flows down the neck of the funnel, check whether the liquid flows down the wall of the cup and feed it to the bottom of the cup. Otherwise, the beaker or the rotating funnel should be moved so that the tip of the funnel sticks to the wall of the beaker to make the liquid Slowly flow down the inner wall of the beaker.
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