Question

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Write about the preparation of Gypsum. ​

Answer 1

Answer:

An interesting approach named as “In-situ Loading-Hydration Process” is proposed and demonstrated to develop a new type of compact gypsum product with load-bearing ability, benefited from excellent hardness and bending strength. In detail, bassanite (CaSO4·0.5H2O) is press-formed in a mold and in-situ hydrated into gypsum (CaSO4·2H2O) under the control of loading-pressure. The maximum hardness of 1.47 GPa and bending strength of 17.8 MPa are achieved at the loading pressures of 50 and 20 MPa, respectively. These outstanding mechanical properties of the processed gypsums are mainly attributed to the low-level porosities and interlocking crystal microstructures.

Answer 2

Answer:

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Preparation: It can be prepared by the action of dilute sulphuric acid on calcium carbonate or calcium hydroxide. Properties:

》 It is a white crystalline solid sparingly soluble in water. On heating to about 437 K, it changes into anhydrous calcium sulphate.