Question

how many water molecules present in the plaster os paris?​

Answer 1

$\frac {1} {2}$ (Half) molecule in plaster of paris.

Explanation:

• Plaster of Paris is commonly applied on the fracture bones to get them fixed again.

• It is prepared using gypsum by heating it at a temperature of 373 Kelvin.

• On heating, the water molecules are removed from the gypsum giving us Calcium hemihydrate which is the chemical name of Plaster of Paris.

• The formula of Plaster of Paris is $CaSo_4.\frac {1}{2}H_2O.$

• The water vapors which are connected to $CaSo_4$ molecule are known as the water of Crystallisation.

Learn more about plaster of paris

Why is Plaster of Paris so called ?

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Formation of plaster of Paris with chemical equation.

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Answer 2

1/2 (Half) water molecules are present in the plaster of paris.

• Molecular formula of plaster of paris is CaSO₄.1/2H₂O
• These water molecules are known as water of crystals.
• Plaster of paris is formed from Gypsum by heating it in 373 K (100° C)
• Gypsum has the molecular formula of CaSO₄.2H₂O
• Plaster of paris is firstly used in Paris for plaster purposes in peoples houses.