The Role of Qualitative Filter Paper In the Experiment

Qualitative filter paper has a wide range of applications. Today we will introduce its main use. The use in the experiment, the following are the details:

The role of qualitative filter paper in university experiments, the qualitative filter paper is an indispensable experimental article in university laboratories, so what role does qualitative filter paper play in the experiment? I remind everyone here that qualitative filter paper contains ash It has little effect on the experimental effect. It is also used on the tray to prevent corrosion when weighing corrosive solids with a tray balance. The main filtering function is to filter out the mixed solid and liquid substances, so as to better achieve the solid The effect of liquid separation.

In the process of use, because the qualitative filter paper has better moisture absorption performance, it is also used to wipe some concentration-related instruments. It has a good moisture absorption effect on the liquid on the instrument. Qualitative filter paper is suitable for filtering industrial organic suspension turbidities such as petroleum, chemical products, and industrial oil to separate solid and semi-solid impurities. For example, the supporting filter press filters various organic liquids such as transformer oil, turbine oil, melted paraffin grease synthetic resin, and dioctyl sebacate.
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The difference between quantitative filter paper and qualitative filter paper is: qualitative filter paper is used for qualitative chemical analysis and corresponding filtration separation; quantitative filter paper is used for gravimetric analysis test and corresponding analysis test in quantitative chemical analysis. The role of quantitative filter paper is mainly used for ashing and weighing analysis experiments after filtration. The ash weight of each filter paper after ashing is a fixed value, and qualitative filter paper is used for general filtration.

Some questions frequently asked by customers

1. In vacuum filtration and natural filtration, should I choose qualitative medium-speed filter paper or qualitative fast filter paper?
How to choose qualitative filter paper correctly?
The fast filter paper is selected for the suction filtration, because the suction is mainly filtered by the filter cake, and the resistance is relatively large. In order to filter quickly, choose the fast filter paper.
Use medium speed for natural filtration, which is slow, easy to form a filter cake, and the filtration effect is better.
2. What is the difference between qualitative filter paper and quantitative filter paper when filtering?
There is no difference in the filtration process. The difference is that the quantitative filter paper has a stable ash value, which can be used for the ignition residue indicator or precipitation analysis in the analysis. Qualitative filter paper does not work.
3. How to improve the filtration speed of ordinary qualitative filter paper?
The fast filter paper is selected for suction filtration, because the suction is mainly filtered by the filter cake, and the resistance is relatively large. In order to filter quickly, choose fast filter paper.
Use medium speed for natural filtration. The speed is slow, it is easy to form filter cake, and the filtration effect is better.