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.

a) Why does an aqueous solution of an acid conduct electricity. b) Ho

1.	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.