How is plaster of paris prepared? What reaction takes place when it sets to a hard mass. b) Explain the general properties of bases

How is plaster of paris prepared? What reaction takes place when it se

1.	How is plaster of paris prepared? What reaction takes place when it sets to a hard mass. b) Explain the general properties of bases
Answer» SOLUTION :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.