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What are Crucibles?

11/5/2013 3:48:21 PM | by Anonymous


Crucibles have varied through time with designs that reflect the process for which they are used as well as regional variation. This can help to prevent the heat from affecting the solution. Crucible forms were derived from the earliest fifth or sixth millennium B.C in the Iran and Eastern Europe.


Crucibles container that can withstand very high temperature and they are used for pigment, glass and metal production as well as a number of modern laboratory processes. Historically, they were usually made from clay and can be made from any material that withstands temperature that is high enough to melt or alter its contents.


Some of the modern days uses of crucibles are namely laboratory, ash content discrimination, chemical analysis and materials and description. Laboratory crucibles are cup shaped pieces of laboratory equipment used to contain chemical compounds when heated to extremely high temperatures. They are available in many different sizes and come with a correspondingly sized crucible cover or lid.


Crucibles and their covers are made of high temperature resistant materials and are usually alumina, porcelain or inert metal. One of the earlier uses to make crucibles was platinum but today people uses metal such as zirconium and nickel. The lids are loose fitting to allow gases to escape during the heating of a sample inside. Lids can come in low and high form shapes and in various sizes but they are rather small 10-15ml size porcelain crucibles that are commonly used for gravimetric chemical analysis.


In the area of chemical analysis, the crucibles are usually used in quantitative gravimetric chemical analysis by measuring the mass of its derivative. The common crucible are precipitate or reside in a chemical analysis method that can be filtered or collected from some solution or sample on special “ash less’ filter paper.


After washing or pre-drying this filtrate, the residue on the filter paper will be placed in the crucible and heated at a very high temperature until all the moisture and volatiles are driven out of the sample residue in the crucible. The mass of the pre-weighted, empty crucible and lid is subtracted from the mass of completely dried residue in the crucible.


Ash content determination is the completely unburnable inorganic salts in a sample and they can be similarly used to determine the percentage of ash contained in the burnable sample of material such as wood, coal and oil. The sample is added to the completely dry crucible and lid together as they are weighted to determine the mass of the sample by difference.

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