What is The name of the copper sulphate after being heated?

Answer 1

Copper Sulphate usually is found in a hydrated form (i.e., water molecules are incorporated into the crystals.) Pure copper sulphate is a pale, greenish gray color. The familiar blue color only occurs in hydrates of copper sulphate (i.e., in crystals that incorporate H20 molecules).

Heating the blue crystals can drive off the water. It's still called copper sulphate after you do that. For substances like copper sulphate that naturally attract water, the adjective, anhydrous often is used to describe the pure (water free) state.

If you heat copper sulphate to a temperature of 650C, it will decompose into something else.

http://en.wikipedia.org/wiki/Copper_sulphate

Answer 2

The name of copper sulfate after being heated is anhydrous copper sulfate. Heating drives off the water molecules from the hydrated form of copper sulfate, leaving behind the anhydrous form.