- exothermic in one direction and endothermic in the other direction
![(http://www.revisescience.co.uk/2010/images/reversible2.jpg)](https://getrevising.co.uk/https_proxy/6521)
Hydrated Copper Sulphate <--> Anhydrous Copper Sulphate + Water
CuSO4.5H2O <--> CuSO4 + 5H2O
Removing water from the hydrated copper sulphate is a chemical reaction and is different from evaporation.
The energy transferred in each direction is the same.
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