What is the purpose of chemical filtration operation?

One sticker: refers to the filter paper should be close to the funnel wall, generally when the filter paper is pasted on the funnel wall, wet with water and squeeze out the bubbles, because if there are air bubbles will affect the filtration speed

Two low: first, the edge of the filter paper should be slightly lower than the edge of the funnel; Second, throughout the filtration process, it is necessary to always pay attention to the liquid level of the filtrate to be lower than the edge of the filter paper. Otherwise, the filtered liquid will flow down from the gap between the filter paper and the funnel and flow directly to the receiver at the bottom of the funnel, so that the unfiltered liquid is mixed with the filtrate, and the filtrate is turbid, and the purpose of filtration is not achieved.

Three reliance: one is the beaker containing the liquid to be filtered when the liquid to be filtered is poured into the funnel.

The beaker spout rests against an inclined glass rod (glass rod drainage); The second is that the lower end of the glass rod should be leaning on the side of the three-layer filter paper (one side of the three-layer filter paper is thicker than the one layer of filter paper, and the three-layer filter paper is not easy to be broken); The third means that the neck of the funnel should be close to the inner wall of the receiver receiving the filtrate.

Sticker: The filter paper fits snugly to the inner wall of the funnel.

Low: 1. The edge of the filter paper is slightly lower than the edge of the funnel 2. The liquid level is lower than the edge of the filter paper when filtering.

Lean: 1, the glass rod is close to the part of the three layers of filter paper 2, the glass rod should be used to drain when filtering, for example, when filtering with a beaker, the beaker is close to the glass rod 3, and the lower part of the funnel is close to the inner wall of the beaker.

One sticker. That is, the filter paper fits snugly to the inner wall of the funnel.

Two low. 1.The edge of the filter paper is lower than the edge of the funnel.

2.The liquid level is lower than the edge of the filter paper.

Three by the eye. 1.The beaker of the mixture is placed next to the glass rod.

2.The lower end of the glass rod is close to the third layer of filter paper.

3.The lower end of the funnel closes against the inner wall of the beaker.

What does the one rent macro stick two low and three rely on the filter method mean The lead type of the filter method is late explained.

The Huai Li answered.

1.One sticker: refers to the filter paper should be close to the funnel wall, generally when the filter paper is pasted on the funnel wall, wet with water and squeeze out the bubbles, because if there are air bubbles will affect the filtration speed

2.Two low: (1) First, the edge of the filter paper should be slightly lower than the edge of the funnel; (2) Second, in the whole filtration process, it should always be noted that the liquid level of the filtrate should be lower than the edge of the filter paper.

3.Otherwise, the filtered liquid will flow down from the gap between the filter paper and the funnel and flow directly to the receiver at the bottom of the funnel, so that the unfiltered liquid and the filtrate are mixed together, and the filtrate is turbid, and the purpose of filtration is not achieved.

4.Three reliance: (1) First, when the liquid to be filtered is poured into the funnel, the beaker containing the liquid to be filtered.

The beaker spout rests against an inclined glass rod (glass rod drainage); (2) The second means that the lower end of the glass rod should lean on the side of the three-layer filter paper (the three-layer filter paper is thicker than the one-layer filter paper, and the three-layer filter paper is not easy to be broken); (3) The third refers to the neck of the funnel close to the inner wall of the receiver receiving the filtrate.

One sticker: the filter paper is slippery and close to the funnel wall.

Two low: the upper edge of the filter paper is lower than the mouth of the funnel, and the liquid level of the solution is lower than the upper edge of the filter paper.

Three-leaning: The lower end of the funnel neck is next to the beaker that receives the filtrate.

The inner wall, the lower end of the drainage glass rod is lightly leaning on one side of the three layers of filter letter paper;

The mouth of the beaker to be strained rests against the lower middle of the glass rod.

One sticker. Even if the filter paper is wet, it adheres to the inner wall of the funnel and does not leave air bubbles. (Prevent air bubbles from slowing down filtration.) ）

Two low. 1 The edge of the filter paper is slightly lower than the edge of the funnel.

2 The liquid level is lower than the edge of the filter paper. (Prevent liquid filtration from being unclean.) Three by the eye. 1 When pouring, keep the beaker close to the glass rod.

2 The lower end of the glass rod is against the three layers of filter paper.

3 The nozzle of the lower end of the funnel is close to the inner wall of the beaker.

One sticker: When filtering, in order to ensure that the filtration speed is fast and to avoid the liquid flowing down the gap between the funnel and the filter paper, the filter paper should be close to the inner wall of the funnel, and there should be no bubbles in the middle

Two low: if the edge of the filter paper is higher than the edge of the funnel, the liquid in the filter is very likely to overflow; If the liquid level in the funnel is higher than the edge of the filter paper, the liquid will also run down the gap between the funnel and the filter paper, which will cause filtration failure

Three leaning: the mouth of the beaker for pouring the liquid should be close to the glass rod, in order to make the liquid flow down the glass rod slowly and avoid the splashing of the liquid; If the lower end of the glass rod is close to a layer of filter paper, if the glass rod punctures the wet filter paper, the liquid will flow down the gap between the funnel and the filter paper, resulting in filtration failure, and leaning on the third layer of filter paper can avoid this consequence; The tip of the nozzle at the lower end of the funnel should be close to the inner wall of the beaker that accepts the filtrate, so that the filtrate can flow down the inner wall of the beaker and avoid the filtrate from splashing out of the beaker

In short, "one stick, two low, and three reliance" are all to ensure the success of the filtration experiment;

Therefore, the answer is: one sticker: the filter paper is close to the inner wall of the funnel;

And low: the edge of the filter paper should be lower than the edge of the funnel, and the liquid level should be lower than the edge of the filter paper;

Three backs: the mouth of the beaker for pouring the liquid should be close to the glass rod, the lower end of the glass rod should be close to the three-layer filter paper, and the tip of the nozzle at the lower end of the funnel should be close to the inner wall of the beaker that accepts the filtrate

Refers to the three important actions that are necessary for the filtering operation.

One sticker: When filtering, in order to ensure that the filtration speed is fast and to avoid the liquid flowing down the gap between the funnel and the filter paper, the filter paper should be close to the inner wall of the funnel, and there should be no bubbles in the middle

Two low: if the edge of the filter paper is higher than the edge of the funnel, the liquid in the filter is very likely to overflow; If the liquid level in the funnel is higher than the edge of the filter paper, the liquid will also run down the gap between the funnel and the filter paper, which will cause filtration failure

Three leaning: the mouth of the beaker for pouring the liquid should be close to the glass rod, in order to make the liquid flow down the glass rod slowly and avoid the splashing of the liquid; If the lower end of the glass rod is close to a layer of filter paper, if the glass rod punctures the wet filter paper, the liquid will flow down the gap between the funnel and the filter paper, resulting in filtration failure, and leaning on the third layer of filter paper can avoid this consequence; The tip of the nozzle at the lower end of the funnel should be close to the inner wall of the beaker that accepts the filtrate, so that the filtrate can flow down the inner wall of the beaker and avoid the filtrate from splashing out of the beaker

"Chemistry for the Third Year of Junior High School" test center: in the operation of filtration experiments: one stick, two low, three leaning.