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  4. When powdered plaster of Paris is mixed with correct amount of water, it sets into a solid mass of

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Q. When powdered plaster of Paris is mixed with correct amount of water, it sets into a solid mass of

J & K CETJ & K CET 2015The s-Block Elements

Solution:

When powdered plaster of Paris mixed with water It takes up the water of crystallisation and forms a Plastic mass that gets converted into hard solid (gypsum) within $6$ to $15\, \min$.
$\underset{\text{Plaster of Paris}}{CaSO _{4} \cdot \frac{1}{2} H _{2} O} \xrightarrow{ H _{2} O (\text { Setting })} \underset{\text{Orthorhombic}}{CaSO_4 \cdot 2H_2O}$
$\xrightarrow {\text{Harderning}} \underset{\text{Monoclinic (gypsum)}}{CaSO _{4} \cdot 2 H _{2} O}$