Question

how is plaster of Paris obtained? write the reaction. why is it called so. write it's two uses also...


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Answer 1

Answer:

Explanation:

On careful heating of gypsum (CaSO4

2 H2O ).

at 373 K it loses water

molecules partially to become calcium sulphate hemihydrate

(CaSO4·½ H2 O).

This is called plaster of paris, the substance which

doctors use as plaster for supporting fractured bones in the right position.

Plaster of paris is a white powder and on mixing with water, it sets into

hard solid mass due to the formation of gypsum.

CaSO4· ½ H2 O+

 1½ H2 O

= CaSO4· 2H2O

Note: You might have noticed that only half a water molecule is shown

to be attached as water of crystallisation.

Answer 2

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$<font color= purple>$ Gypsum is the common name of calcium sulphate-2-water. When heated, gypsum loses three-quarters of its water forming Plaster of Paris. The most obvious use of Plaster of Paris is the plaster cast supporting broken limbs and keeping the bones together for healing to take place.....

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