Most likely so the glass will not crack as it expands as a result of being heated by a hot solution being poured into it.
I will assume this has to do with recrystallisation.
When performing recrystallisation, it is important to keep all of the equipment, glassware and solutions hot to avoid the goal product to crystallise while it is being filtered. If this occurs product will be lost.
If this does happen, rinsing with heated solvent may redissolve the crystallised product from the filter paper and recover it. The extra solvent will make recrystallisation more difficult later though.
Most likely so the glass will not crack as it expands as a result of being heated by a hot solution being poured into it.
It reduces premature crystralization in the funnel which would block it up.
try distilling the solution..
Baljet reagent freshly prepared (95 ml 1% picric acid + 5 ml 10% NaOH) mixed immediately before use and filtered through a sintered glass funnel.
Separation of solids from a liquid solution.
Usually, it's used to separate a precipitate from the liquid in the solution. The filter paper is folded into quarters and placed in the funnel. The solution is then poured onto the filter paper, where the liquid filters through and the precipitate stays on the filter paper. The precipitate can then be saved or discarded, depending on which part of the solution you want.
chicken
only suspended particles are filtered
The stem of a funnel needs to be firmly set in the container that you wish the filtered item be stored in. The stem is the smaller part of the funnel usually located at the bottom of the funnel.
it's done to minimize the mixing of air into the filtered solution. By touching the stem to the collecting beaker, the solution flows into the beaker smoothly rather than splashing into it.
it's done to minimize the mixing of air into the filtered solution. By touching the stem to the collecting beaker, the solution flows into the beaker smoothly rather than splashing into it.
try distilling the solution..
Baljet reagent freshly prepared (95 ml 1% picric acid + 5 ml 10% NaOH) mixed immediately before use and filtered through a sintered glass funnel.
Also known as a Buchner or vacuum flask, the flask uses vacuum to filter samples. A vacuum hose is attached to the hose barb and the funnel is placed on top. As the hose creates a vacuum, the sample is filtered through the funnel.
Wet filter paper adheres better to the funnel.
by using separating funnel
Separation of solids from a liquid solution.
If you have a multipurpose funnel and some tissue paper, layer two or three peices and carefully place them inside the funnel as one sheet. Put the funnel over a glass and add the solution into the funnel (not too much) and wait for results. Mail me back if the results were positive.
Usually, it's used to separate a precipitate from the liquid in the solution. The filter paper is folded into quarters and placed in the funnel. The solution is then poured onto the filter paper, where the liquid filters through and the precipitate stays on the filter paper. The precipitate can then be saved or discarded, depending on which part of the solution you want.