2006-09-06 04:14:33 · 18 answers · asked by Rashmi 1 in Science & Mathematics ➔ Other - Science
Plaster of Paris, or simply plaster, is a type of building material based on calcium sulfate hemihydrate, nominally CaSO4*0.5H2O. It is created by heating gypsum to about 150ºC. CaSO4 · 2H2O → CaSO4 · 0.5H2O + 1.5H2O (released as steam).
2006-09-06 04:20:04 · answer #1 · answered by Nirmal87 2 · 0⤊ 0⤋
Plaster of Paris, or simply plaster, is a type of building material based on calcium sulfate hemihydrate, nominally CaSO4*0.5H2O. It is created by heating gypsum to about 150ºC. CaSO4 · 2H2O â CaSO4 · 0.5H2O + 1.5H2O (released as steam).
A large gypsum deposit at Montmartre in Paris is the source of the name[1]. When the dry plaster powder is mixed with water, it re-forms into gypsum, initially as a paste but eventually hardening into a solid. The structure consists of sheets of Ca²+ and SO4²- ions held together by hydrogen bonds in the water molecules. The grip between these sheets is easily broken, so plaster is fairly soft.
Plaster is used as a building material similar to mortar or cement. Like those materials plaster starts as a dry powder that is mixed with water to form a paste, which then hardens. Unlike those materials plaster remains quite soft after drying, and can be easily manipulated with metal tools or even sandpaper. These characteristics make plaster suitable for a finishing, rather than a load-bearing material.
2006-09-06 11:20:44 · answer #2 · answered by missourim43 6 · 1⤊ 0⤋
Calcium Sulphate HemiHydrate
2006-09-09 13:29:06 · answer #3 · answered by sunder_rangarajan 2 · 0⤊ 0⤋
Plaster of Paris, plaster, is a type of building material based on calcium sulfate hemihydrate, nominally CaSO4*0.5H2O
2006-09-06 13:59:09 · answer #4 · answered by doctor asho 5 · 0⤊ 0⤋
Plaster of Paris is chemically known as Calcium Sulphate hemihydrate (CaS04.1/2H20). I hope you get satisfied by this answer.
2006-09-06 13:44:49 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Calcium Sulfate
calcined gypsum in white, powdery form, used as a base for gypsum plasters, as an additive of lime plasters, and as a material for making fine and ornamental casts: characterized by its ability to set rapidly when mixed with water
2006-09-06 11:23:45 · answer #6 · answered by Eco-Savvy 5 · 0⤊ 0⤋
Plaster of Paris is based on calcium sulfate hemihydrate, nominally CaSO4*0.5H2O. It is created by heating gypsum to about 150ºC. CaSO4 · 2H2O â CaSO4 · 0.5H2O + 1.5H2O (released as steam).
2006-09-06 11:18:57 · answer #7 · answered by Kaku 1 · 1⤊ 0⤋
Plaster of paris is chemically known as calcium carbonate(CaCO3). You can test it by putting some vinegar(acetic acid) over it. It will react!
2006-09-08 02:16:46 · answer #8 · answered by § mǎddy § 2 · 0⤊ 0⤋
Gypsum
2006-09-06 11:20:27 · answer #9 · answered by Naresh C 3 · 0⤊ 0⤋
It is gypsum --
known as "calcium sulphate hemihydrate" .
CaSo4.*0.5H2O
2006-09-06 11:43:42 · answer #10 · answered by Infinity 7 · 0⤊ 0⤋