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Use of filter paper
Apr 27, 2017

The use of filter paper in the experiment with more filters and the funnel funnel and other instruments used together. The filter paper should be folded into the appropriate shape before use, and the common folding method is to fold the filter paper into a similar flower shape. The higher the degree of the folding filter paper, the higher surface area can be provided, the better filtration effect, but should be careful not excessive folding and resulting in the breakdown of filter paper. Put the drainage glass rods on the multilayer filter paper, force evenly, avoid filter paper damage.

Operation Process

1. Fold the filter paper, two consecutive times, fold up to 90 ° central angle shape.

2. Put the stack of filter paper, on one side three floors, on the other side of a layer open, into a funnel shape.

3. The funnel-shaped filter paper into the funnel, the filter paper edge to lower than the funnel, pour some water into the funnel mouth, so that the soaked filter paper and funnel wall paste, and then the remaining water poured out, to be used.

4. Placing the funnel in which the filter paper is mounted on a funnel rack, such as a ring on an iron rack, a beaker or test tube that accepts a filter in the funnel neck, and the tip of the funnel neck is leaned against the wall of the admission vessel.

5. When injected into the funnel, the right hand holds the liquid beaker and the left hand holding the glass rod. The lower end of the glass rod is tight funnel three layer on the lower side, so that the cup mouth close to the glass rod, to filter liquid along the cup outflow, then the tilt of the glass rod, flowing into the funnel into the liquid, the liquid surface can not exceed the height of the filter paper.

6. When the liquid is filtered by the paper, along the funnel neck, check whether the liquid is flowing down the glass wall and note to the bottom of the cup. Otherwise, the beaker or rotary funnel should be moved so that the funnel tip is fastened to the beaker wall, allowing the liquid to flow slowly along the inner wall of the beaker.