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Question
A compound X which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water.
- Identify the compound X.
- Write the chemical equation for its preparation.
- For what purpose is it used in hospitals?
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Solution
- Compound X is plaster of Paris, or calcium sulphate half-hydrate.
- \[\ce{CaSO4 * 2H2O ->[373 K] CaSO4 * 1/2 H2O + 1 1/2 H2O}\]
- In hospitals, it is primarily used to set fractured or dislocated bones into the correct position. When mixed with the right amount of water, it forms a hard, solid mass that keeps the bone immobilised so it can heal properly. It is also used to make casts and moulds in dentistry.
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