A compound of calcium is used in hospitals for setting fractured bones.

(a) Which is that compound ? Write its chemical name and formula ?

(b) How is it prepared ?

 As my from above said it is plaster of paris which is a hemihydrate and its chemical formulae is given by caso4.1/2h2o.

It is a quite easy process . The crystalline gypsum with chemical formulae cuso4.2h2o is heated there by making it lose it water of crystalisation and turning it into a a raggy substance .When this substance is mixed with adequent out of water it hardens in about 5 mins