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What shape is the filter paper made into before being placed into funnel?
Wiki User
∙ 11y ago
Traditionally, for most class work, one simply folds the round filter paper in half and then in half again, forming a quarter circle. Then you spread open 3 of the loose edges versus one loose edge to form a cone. The cone is then inserted in the funnel and wet down with distilled water until a stream accumulates in the long tube of the glass filtration funnel. This stream tends to accelerate filtration by causing a minor gravity pull or vacuum. True lab purists will add the additional steps of making the second 'half' fold in such a way that it is not quite 50% or equal. Then snipping with scissors or tearing about a quarter inch off the outer corner of the shorter segment. This corner goes on the outside of the 3-loose-edges side of the cone. The theory is that this creates a slightly broader cone which will make better contact with the walls of the funnel thus better retaining the vacuum.
Wiki User
∙ 15y ago
Wiki User
∙ 14y agoHere's the general way for a regular funnel (not for a Buchner funnel): Take the circle of filter paper and fold it in half. Fold it in half again so that you've got a quarter-circle of filter paper. Now squeeze the straight edges together slightly and spread the layers to make a cone; you should have one layer of paper on one side of the cone and three on the other side. Pop it into the funnel. It may help to wet the funnel with solvent first so that the paper "sticks" a little bit. For a Buchner funnel, you just set the circle of filter paper flat in the funnel without folding.
Wiki User
∙ 11y agoeasy its a rectangle i had this question on my science homework
Wiki User
∙ 12y agoFold the circle paper in half and half again so you have a quater then to open it out put 3 sides to 1.
Wiki User
∙ 8y ago- the exposed area is larged
- the drain of filtrate is easier
Wiki User
∙ 8y ago- the exposed area is larged
- the drain of filtrate is easier
Wiki User
∙ 11y agohindi ko rin alam e
Wiki User
∙ 10y agowala eh
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So the liquid doesn't damage the lenses
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