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  2. byjus.com › question-answer › why-we-call-hemiWhy we call hemihydrated calcium sulphate as plaster of paris

    Q. Plaster of Paris is known as calcium sulphate hemihydrate because two formula units of C a S O 4 share one molecule of H 2 O.

  3. www.britannica.com › technology › plaster-of-parisPlaster of paris | Definition, Uses, & History | Britannica

    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

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  5. material-properties.org › plaster-of-parisPlaster of Paris | Formula, Properties & Application

    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.

  6. thisvsthat.io › calcium-sulfate-vs-plaster-of-parisCalcium Sulfate vs. Plaster of Paris - What's the Difference ...

    Calcium sulfate and Plaster of Paris are both forms of calcium sulfate hemihydrate, but they differ in their physical properties and uses. Calcium sulfate is a naturally occurring mineral that is commonly found in the form of gypsum.

  7. www.artmolds.com › blogs › mold-makingThe history, development and applications of Plaster of Paris

    Feb 18, 2024 · Plaster of Paris has its origins in the Paris Basin, where large deposits of gypsum were found. The production of plaster of Paris involves a process called calcination, where the gypsum is heated to remove the water content and create calcium sulfate hemihydrate.

  8. www.ncbi.nlm.nih.gov › pmc › articlesPlaster of Paris: Past, present and future - PMC

    Oct 16, 2013 · Plaster of Paris is calcined gypsum (roasted gypsum), ground to a fine powder by milling. When water is added, the more soluble form of calcium sulphate returns to the relatively insoluble form, and heat is produced [2 (CaSO 4 .½ H 2 O) + 3H 2 O → 2 (CaSO 4 .2H 2 O) + Heat].

  9. www.gypsonaplaster.com › the-science-of-plaster-ofThe Science of Plaster of Paris: How It Works and Why It's So ...

    Mar 24, 2023 · The chemical composition of plaster of Paris is calcium sulfate hemihydrate, which means that it contains about half as much water as gypsum. When mixed with water, the hemihydrate crystals dissolve and rehydrate to form the dihydrate crystals, which are then deposited as interlocking crystals.

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