Reversible reactions – one in which products can turn back into reactants
Dehydration of hydrated copper (II) sulphate:
- Hydrated copper(II) sulphate contains water of crystallisation (CuSO4.5H2O)
- The water can be driven off with gentle heating
- CuSO4.5H2O → CuSO4 + 5H2O
- Anhydrous copper sulphate react with water to reform hydrated copper sulphate
- CuSO4 + 5H2O → CuSO4.5H2O
Combining the two:
- CuSO4.5H2O CuSO4 + 5H 2O