How is Calcium Sulphate (Plaster of Paris), CaSO4·½ H2O (hemihydrate of calcium sulphate) prepared from gypsum?

How is Calcium Sulphate (Plaster of Paris), CaSO4·½ H2O (hemihydrate of calcium sulphate) prepared from gypsum? 
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1 Answer

Answer :

It is obtained when gypsum, CaSO4·2H2O, is heated to 393 K.

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Above 393 K, no water of crystallisation is left and anhydrous calcium sulphate, CaSO4 is formed. This is known as ‘dead burnt plaster’. It has a remarkable  property of setting with water. On mixing with an adequate quantity of water it forms a plastic mass that gets into a hard solid in 5 to 15 minutes.  

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Last Answer : ' solutions : -

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Last Answer : answer:

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Last Answer : 2CaSO4.H2O

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Last Answer : Compound of Calcium. When hydrated, the form is rigid. Blessing for broken bones. Also used for architecture designing(Model designing), Sculpures and for filling purposes in different areas.

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Which of the following salts do not have the water of crystalisation? (i) Bleaching Powder (ii) Plaster of Paris (iii) washing soda (iv) Baking soda (a) (ii) and (iv) (b) (i) and (iii) (c) (ii) and (iii) (d) (i) and (iv)

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What is the name and chemical formula of the main product formed by heating baking soda. (a) sodium carbonate,Na 2 CO 3 (b) Bleaching powder ,CaOCl 2 (c) sodium chloride,Na Cl (d)Plaster of paris ,CaSO 4 .I/2H 2 O

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Last Answer : (A) Hydration

CaCl(OCl) is the chemical formula of (A) Hypo (B) Bleaching powder (C) Plaster of Paris (D) Aqua regia

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Which mineral is used to make the Plaster of Paris?

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Enlist constituents of Plaster of Paris and state the two uses of Plaster of Paris

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Define plaster of Paris. State its uses.

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State any two uses of "Plaster of Paris".

Description : State any two uses of "Plaster of Paris".

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Which of the following is used for wrapping of fractured bones? (1) White cement (2) White lead (3) Zinc oxide (4) Plaster of Paris

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Last Answer :  Plaster of Paris

Pick up the correct statements from the following: (A) Cracks appear on the plastered surface in the form of hair cracks (B) In brick work, the efflorescence is removed by applying a solution of zinc sulphate and water (C) Excessive thermal variations in the backing or plaster causes the plaster to fall (D) All the above

Description : Pick up the correct statements from the following: (A) Cracks appear on the plastered surface in the form of hair cracks (B) In brick work, the efflorescence is removed by applying a solution ... Excessive thermal variations in the backing or plaster causes the plaster to fall (D) All the above

Last Answer : Answer: Option D

Ammonium sulphate can be produced by reacting gypsum with (A) Ammonia (B) Ammonium carbonate (C) Nitric acid (D) None of these

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Last Answer : (B) Ammonium carbonate

Quick setting cement is produced by adding (A) Less amount of gypsum in very fine powdered form (B) More amount of gypsum in very fine powdered form (C) Aluminium sulphate in very fine powdered form (D) Pozzolana in very fine powdered form

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Last Answer : Answer: Option C

A sulphate salt of group 2 element of the periodic table is white ,soft substance which can be moulded into different shapes by making its dough.Identify the salt . (a) CaSO4.1/2 H2O (b) CaSO4.2H2O (c) 2CaSO4. 1⁄2 H2O (d)CaSO4

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Last Answer : (a) CaSO4.1/2 H2O

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Hardness of the water is commonly measured in terms of - (1) Calcium carbonate equivalents (2) Calcium sulphate equivalents (3) Magnesium carbonate equivalents (4) Magnesium sulphate equivalents

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