Question

(a) What will happen if heating is not controlled while preparing plaster of Paris?
(b) Write an equation to show the reaction between plaster of Paris and water.

Answer 1

Answer:

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Answer 2

Explanation:

• a) It should not be admitted to raise over 152°C (425K) cause, if the amount of the water is dropped then anhydrous calcium sulfate is generated, which is called total burned plaster and it does not have the features of Paris""s Plaster.
• b) Plaster of Paris when acts with water releasing heat by crystallization. Gypsum is generated by heating plaster of Paris to about 150-degree Celsius.
• When the dry plaster of Paris powder is combined with water it transforms into gypsum.
• Based upon the temperature gypsum followers to hemihydrate or anhydrous form.