Question : a) Why does an aqueous solution of an acid conduct electricity. b) How is plaster of paris prepared ? What reaction takes plaster place when its sets to a hard mass.

Question : a) Why does an aqueous solution of an acid conduct electric

1.	Question : a) Why does an aqueous solution of an acid conduct electricity. b) How is plaster of paris prepared ? What reaction takes plaster place when its sets to a hard mass.
Answer» SOLUTION :a) The presence of hydrogen (`H^(+)`) or hydronium(`H_(3)O^(+)`) ions in the aqueous solution of an acid are responsible for conducting ELECTRICITY b) 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)O + 1 (1)/(2)H_(2)O` On mixing with water it converts to a hard MASS to form gypsum again i,e the reverse reaction takes place.