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Question
A compound which is prepared from gypsum has the property of hardening when mixed with water. identify the compound and write its formula. How is this compound prepared? Describe it in the form of a chemical equation only.
Solution
Plaster of pairs is a substance made from gypsum that hardens when combined with the right amount of water and has the chemical formula CaSO4.H2O. Calcium sulphate hemihydrate, or CaSO4.1/2H2O, is its chemical name. Gypsum is heated to 373K to create plaster of pairs. Gypsum crystallises into plaster of Paris when heated, losing three-fourths of its crystallisation water.
\[\ce{\underset{Gypsum}{CaSO_4*2H_2O}->[373K]CaSO_4*\underset{plaster of paris}{1/2H_2O +}3/2H_2O}\]
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