why does POP said to a hard mass after mixing with water and leaving it for some time?
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Plaster of Paris is mixed with water and then used for different purposes . But if it is left unused for sometime it changes to hard gypsum .
CaSO4.1/2H2O + 3/2 H2O gives CaSO4.2H2O
(POP). ( GYPSUM)
CaSO4.1/2H2O + 3/2 H2O gives CaSO4.2H2O
(POP). ( GYPSUM)
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