The green solid $\text{Nickel(II) sulfate}$ dissolves in water. Which method would be used to separate a pure sample of nickel(II) sulfate crystals from a mixture containing nickel(II) sulfate and sand?
- AHeat the mixture with water and distil it to give nickel(II) sulfate.
- BHeat the mixture with water and leave it to crystallise.
- CHeat the mixture with water and filter off the nickel(II) sulfate.
- DHeat the mixture with water, filter and allow the solution to crystallise.