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How is plaster of paris prepared?...

How is plaster of paris prepared?

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Plaster of paris is prepared by heating gypsum to a temperature of `100 ^(@) C`. The following reaction takes place:
`CaSO_(4). 2H_(2)O to CaSO_(4). (1)/(2) H_(2)+ 1(1)/(2)H_(2)`
On mixing with water it retracts to a hard mass to form gypsum again i.e., the reverse reaction takes place.
b) * Bases possess a bitter taste
* Bases are slippery to touch.
* Bases turn red litmus blue Bases turn phenolpthalein solution pink
* Strong base like caustic soda (NaoH) caustic potash (KOH) are corrosive in nature and produce burning sensation on the skin
* Solution of bases in water conduct electricity
* Bases react with acid, neutralise them.
* Producing salt and water.
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