Friends who do laboratory analysis in the laboratory are no strangers to filter paper, and they also know that the function of filter papers is not limited to filtration. Below are other ways filter paper uses in the lab.
Uses of the filter papers:
What is filter paper used for:
The carbon tetrachloride of the oil analysis project needs to be adsorbed with activated carbon before use, but the volatility of carbon tetrachloride is very large, and sometimes one-fifth of the bottle can be lost in 20 minutes, and there is no matching adsorption column. So covered the top of the adsorption column with filter paper and secured it with a rubber band.
The greatest performance of filter paper is that it has very good water absorption, so sometimes burettes or separatory funnels, or other analytical items, will choose to use filter paper to absorb excess reagents.
Wipe off excess reagent from the cuvette.
Use filter paper to compare the titration color during titration.
We need to remove the sugar coating when testing sugar-coated tablets. Wet the icing layer with water and wipe off the icing.
Then use filter paper to absorb the outside moisture, and finally put it in the dryer to dry. Ordinary tablet production was successful.
When drying some reagents that do not need to be weighed, put a filter paper at the bottom to facilitate drying. One thing is that some filter papers can become discolored and brittle after drying, so be careful.
No filter head for a while and if you want to filter, crumple the filter paper into a small ball and put it into the syringe. It is also a simple and inexpensive filter unit.
Usage methods of the filter papers:
Filter paper used in the laboratory:
Fold the filter paper（all pore sizes: like 11 micron filter paper) in half twice and fold it at a right angle.
Open the side layer of the folded filter paper, and open it to form a funnel.
Put the folded funnel-shaped filter paper into the funnel. Note that the edge of the filter paper must be lower than the edge of the funnel.
Pour some water into the mouth of the funnel, let the filter paper in the funnel completely wet, stick to the inner wall of the funnel, and then pour out the remaining water.
Put the funnel on the funnel rack, and the neck of the lower end of the funnel must be close to the container wall below.
Hold the beaker in the right hand and the glass rod in the left hand, put the glass rod close to the mouth of the beaker, put the glass rod under the filter paper at the bottom of the lower end of the funnel, and slowly pour out the liquid in the beaker and flow into the container below.