Question

A sulphate salt of group 2 element of the priodic table is a white, soft substance, which can be moulded into different shapes by making its dough. When this compound is left in open for some time, it becomes a solid, mass and cannot be used for molding purposes. Identify the sulphate salt and why doies it show such a behaviour? Give the reaction involved

Answer 1

sulphate salt is plaster of paris and reaction is 2(Caso4.2H2O)____ 2Caso4.H2O +3H2O