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Mica, Limestone and Its Production

What causes p...

Question

What causes plaster of Paris to harden when left undisturbed after mixing with water?

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Solution

Chemical formula for plaster of Paris is $C a S O_{4}$ . $\frac{1}{2} H_{2} O$ . When it combines with water it gets converted into gypsum ie. $C a S O_{4} . 2 H_{2} O$ which is an ore of calcium and is hard in nature.

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