Jennelle Cadogan Chemistry Upper 6th A

Assignment #2Suction Funnel

A Suction Funnel is a piece of laboratory equipment used for filtration. These funnels may be either

made of porcelain, glass or ceramic. The filtration material, usually filter paper, is placed on the porous

plate of the suction, and the filter paper is moistened with a solvent to prevent initial leakage. The liquid

to be filtered is poured into the cylinder and drawn through the perforated plate by vacuum suction.

Some glass suction funnels have their bases made of very porous sintered glass, thus eliminating the

need for filter paper. This base

also acts as a better filter

material, however, the filtration

process will take a longer time.

Some types of filter funnels are

the Büchner and Hirsch funnels.

Suction Flask

Suction/Büchner/Sidearm flasks

are a flat-bottomed flasks made

of very thick and resistant glass.

They are usually a cone shape and (Diagram showing the Suction Funnel and Suction Flask )

have a side neck, usually affixed to the side, 2 / 3 up from the bottom.

These flasks are used to cooperate with vacuum aspirator or vacuum pumps in the vacuum filtration, or

as additional security during the distillation and other processes carried out under reduced pressure. It is

used with a suction funnel to allow for the suction and collection of the filtrate. The suction flask can

also be used as a vacuum trap in a vacuum line to ensure that no fluids are carried over from the

aspirator or vacuum pump (or other vacuum source) to the evacuated apparatus or vice versa.

Jennelle Cadogan Chemistry Upper 6th ASilica Crucible

A crucible is a container that can withstand very, very high

temperatures and is used for metal, glass, and pigment production as

well as a number of modern laboratory processes. As the name

suggests, a Silica Crucible is a crucible made of silica. It is resistant to

very, very temperatures, and is thus mainly used to melt glass. It is also used for evaporation. They are

sometimes used as a storage containers as they usually come with suitably sized covers. When heated

over a flame, the crucible is often held inside a pipe clay triangle which itself is held on top of a tripod.

Sintered Glass Crucible

Sintered glass is a glass mesh-like material used for filtration.

It is preferable to filter paper. It’s permanently porous, thus

allowing this type of glass to produce various pieces of

glassware. The porosity of sintered glass is labelled by

integers from 0 – 5. Sintered glass with a porosity of 0 will have a pore size of 160-250 micrometres and

is considered course filtration as fluid will pass through it quickly and some finer solids will pass

through. However, those with a porosity of 5 has a pore size of 4-10 micrometres so even ultrafine solids

will not pass through and liquids will drop through very slowly. A sintered glass crucible is thus used to

mainly to filter solutions and mixtures when the residue is desired and when minimal residue is sought

in the filtrate. It is also used in place of filter paper as it can be less porous and is reusable, thus making

it cheaper.

Furnace

A furnace is a heating device used in the laboratory to heat substances,

mixtures and solutions. However, furnaces allow for heating at very high

temperatures and can also maintain the temperature desired for the substance

to be heated. The fact that it is enclosed increases safety, and minimises,

almost eliminating, changes in temperature within the furnace once that

temperature is attained. The time taken to reach that temperature depends on

Jennelle Cadogan Chemistry Upper 6th Athe furnace being used, but is normally relatively fast when compared to using a Bunsen burner.

Furnaces are insulated to prevent heat loss and to prevent its extremities from getting hot.