Question

plaster of paris on mixing with water produces

Answer 1

CaSO4.1/2H2O + 3/2H2O -> CaSO4.2H2O

where CaSO4.1/2H2O is plaster of Paris

and CaSO4.2H2O is gypsum

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Answer 2

actually, plaster of Paris is formed by heating of gypsum at 140°C to 180°C.
reaction is ......
$CaSO_4.2H_2O(\text{gypsum})\rightarrow CaSO_4.\frac{1}{2}H_2O(\text{plaster of Paris})$

so, if we mix plaster of Paris of Paris with water, it becomes hard to form gypsum.
e.g., $CaSO_4.\frac{1}{2}H_2O+\frac{3}{2}H_2O\rightarrow CaSO_4.2H_2O$

hence, plaster of Paris on mixing with water produces gypsum.