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Question

A doctor applied surgical bandages on the fractured bones of a patient after making them wet. What changes are likely to occur?


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Solution

  1. The surgical bandages which are used on the fractured bones are made up of Plaster of Paris.
  2. Plaster of ParisCaSO4·12H2O is a compound that is made by heating gypsumCaSO4·2H2O at a very high temperature nearly about 373K.
  3. It is made wet before applying to the fractured bones because when it is mixed with a certain quantity of water it changes into gypsum and Gypsum has a hardening property.

CaSO4·12H2O+32H2OCaSO4·2H2O

Thus, surgical bandages become harder when they wet.


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