Which statement concerning water of crystallisation is correct?
- AThe ratio of $\text{CoCl}_2 : \text{H}_2\text{O}$ in hydrated cobalt(II) chloride is $6:1$.
- BThe ratio of $\text{CuSO}_4 : \text{H}_2\text{O}$ in hydrated copper(II) sulfate is $1:5$.
- CWhen a saturated solution is heated, the water that evaporates is called the water of crystallisation.
- DWhen white copper(II) sulfate is heated, blue crystals are formed.