A white powder is used by doctors to support fractured bones.(a) Write the name and chemical formula of the powder.(b) How is this powder prepared?(c) When this white powder is mixed with water, a hard solid mass is obtained. Write a balanced chemical equation for the change.(d) Give one more use of this white powder.


(a) The name of the white powder is Plaster of Paris. Its chemical formula is CaSO4.2H2O (hydrated calcium sulphate).

(b) Plaster of Paris is prepared by the heating process of gypsum or the dihydrated calcium sulphate.

(c) The chemical reaction between Plaster of Paris and water is given below:
$CaSO_4.½H_2O + 1½H_2O \rightarrow CaSO_4 .2H_2O$

(d)  Plaster of Paris is also used for several construction works and for making several pottery items.

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Updated on: 10-Oct-2022

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