Question

What mixed water POP sets to a hard mass. Explain.

Answer 1

When POP ( Caso4.1/2H2o) is mixed with water

it forms a hard mass known as Gypsum ( Caso4.2H2o)

The reaction is as follows:

CaSo4.1/2H2o + CaSo4.1 1/2 H2o = CaSo4.2H2o

Hope it helps...