What is the purpose of heating the crucible before starting the experiment?
The empty crucible is heated to remove moisture and ensure that the crucible is completely dry as any water present may affect the reading. Most crucibles are made of ceramics,upon heating them with hydrated salt with water it will expand and contract, thereby breaking away.
Why is it important to begin the experiment with a clean and dry crucible?
Waiting for the crucible to heat longer would have ensured there was absolutely no water left in it. Drying the crucible completely and ensuring it was clean in the beginning would have prevented experimental error as well.
Why should a crucible be washed before drying it?
The sintered glass crucible is used to filter the silver chloride precipitate (or other solid) from its parent liquid. Before this crucible can be used for filtering it must be cleaned, then dried to constant weight. These tare weights can be used to determine the total solid in the weighing bottle.
Why I wrote The Crucible summary?
During the tense era of McCarthyism, celebrated playwright Arthur Miller was inspired to write a drama reflecting the mass cultural and political hysteria produced when the U.S. government sought to suppress Communism and radical leftist activity in America.
Why is it important for the crucible lid to be offset?
To get a good result, be sure to keep the lid on the crucible while cooling to prevent moisturefrom the atmosphere interacting with the anhydrous salt, especially if the lab is humid. This willcause the mass of water (and therefore the percent of water) to be too low. Hot crucible look like cold crucibles.
What is crucible made of?
Crucibles and their covers are made of high temperature-resistant materials, usually porcelain, alumina or an inert metal. One of the earliest uses of platinum was to make crucibles. Ceramics such as alumina, zirconia, and especially magnesia will tolerate the highest temperatures.
How does the crucible connect to today?
The Crucible is related to modern times because even though it takes place in the seventeenth century, it describes a pattern of behavior we still see in moral panics today—namely, the potential for fear to become hysteria and end in tragedy.