funnel
The funnel is a cylindrical object that is used to inject liquid and young powder into a smaller container. The smaller tubular portions of the funnel can have different lengths. The funnel is usually made of stainless steel or plastic, but the paper funnel is sometimes used for substances that are difficult to clean thoroughly, such as engine oil. Some funnels have controllable shutters at the nose that allow the user to control the rate of fluid inflow. Funnels are common in kitchens; funnels are also found in laboratories, and filter papers are sometimes used to filter out chemicals such as crystals.
Common classification
There are many types of funnels, such as common funnels, hot water funnels, high pressure funnels, separatory funnels, and safety funnels. According to the size of the caliber and the length of the diameter, it can be divided into different models. A 6cm short neck funnel is generally used in elementary school nature teaching.
Basic use
The funnel is an indispensable instrument in filtration experiments. When filtering, filter paper is loaded into the funnel. There are many kinds of filter papers. Different filter papers can be selected according to the different requirements of filtration. Ordinary filter paper can be used for natural teaching. Filter paper of corresponding size should be purchased according to the size of the funnel.
Instructions
1. The filter paper was 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 installed filter funnel placed in a funnel with a filter holder, (such as a ring of iron stand), the funnel neck receiving filtrate decentralized beaker or test tube, the neck and the funnel tip against the wall of the receiving container, To prevent liquid splashing.
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 to see if 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, allowing the liquid to flow down the wall.
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