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May 3, 2023 · Plaster of Paris powder is made with dehydrated gypsum. Its technical name is calcium sulfate hemihydrate, and it’s designed to harden when exposed to moisture.
Mar 14, 2024 · plaster of paris, quick-setting gypsum plaster consisting of a fine white powder (calcium sulfate hemihydrate), which hardens when moistened and allowed to dry. Known since ancient times, plaster of paris is so called because of its preparation from the abundant gypsum found near Paris.
- The Editors of Encyclopaedia Britannica
- Measure out the water. Cover your work area with a plastic mat or with newspapers. Find a mixing container (preferably a disposable one) that could accommodate the amount of mixture intended.
- Measure out the powder. Measure out the plaster of paris powder and put it into another container. Break up any lumps of powder with a spoon. Remember that the ratio should be 2 parts powder to 1 part water.
- Start adding the powder. Start adding the plaster of paris powder to the water in your mixing container by sprinkling or sifting the powder over the water.
- Tap the side of the container. Do not mix yet. Instead, tap the side of the container with a spoon to disperse the powder into the water and remove any air bubbles.
Scientifically known as Calcium Sulfate Hemihydrate, Plaster of Paris is chemically represented as CaSO 4 .1/2H 2 O. This represents the ratio of calcium sulfate to water, suggesting that for each molecule of calcium sulfate, there is half a molecule of water.
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Apr 11, 2022 · Plaster of Paris is a building product made by mixing fine white powder (calcium sulfate) and water. When combined, the calcium sulfate forms a strong bond. This bond creates a very durable substance called gypsum, which goes on to harden. The resulting hardened plaster can be used in various ways.
While we have seen many applications of this material in our everyday lives, if we try to understand its chemistry, plaster of Paris is a white powdery chemical compound, which is hydrated calcium sulphate that is usually obtained from calcining gypsum.
