Identify the compound of calcium, which is used for plastering fractured bones. With the help of an equation, show how it is prepared.
Answers
Answer:
The compound of calcium which is used for plastering of fractured bones is Plaster of Paris. It is also called as Calcium Sulphate Hemihydrate.
Explanation:
1) Calcium sulphate occurs in nature in the form of anhydrite (CaSO4) and gypsum (CaSO4. 2H2O). Large deposits of gypsum are found in India mainly including the states of Punjab and Rajasthan.
2) The effect of heating gypsum is quite interesting. Initial heating changes its crystal structure. On further heating to 390 K, it forms hemihydrate with the molecular formula CaSO4. 1/2 H2O or (CaSO4)2. H2O. This hemihydrate is termed as Plaster of Paris.
3) The reaction is as follows [Reaction temperature is less than equal to 390 K]:
2CaSO4. 2H2O → CaSO4. 1/2 H2O + 3H2O
4) On further heating above 473 K, the water of crystallization from the molecule vanishes and the anhydrous calcium sulphate is obtained. It is known as dead burnt plaster and does not set when mixed with water.
5) The reaction is as follows [Reaction temperature is greater than equal to 473 K]:
CaSO4. 1/2 H2O → 2CaSO4 + H2O
6) The main precaution which needs to be taken is that plaster of Paris should not be heated above 473 K as it will lose all the molecules of water of crystallization and it will turn into dead burnt plaster, and it will not set even when it is mixed with water.
Answer:
POP ( plaster of Paris ) is the compound of calcium that is used in plastering of factured bones. The. chemical name of pop is calcium sulphate hemihydrate ( CaSo4.1/2 H2o) . It is prepared by heating gypsum (heat plaster of Paris )at 373kelvin .
The equation is-
CaSo4 . 2H2O ---------> CaSo4.1/2 H20 + 3/2 H2O