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Anhydrous salts are those which have lost their water of crystallization . For example CuSo4 , FeSo4 etc
Hydrous salts are those which have their water of crystallization . For example Feso4.;5H20
Plaster of Paris is prepared by heating gypsum(CaSo4.2H2o) at 373k it forms plaster of paris (CaSo4) . (Plaster of Paris is a anhydrous form of gypsum) and one and a half molecule of water
Reaction which takes place is plaster of paris is again combined with water to form gypsum which is hard .
CaSo4 + 1 1/2 H2O -----> CaSo4.2H2O
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