Techniques used in the separation of mixtures include:
A crystallisation
B filtration
C fractional distillation
D simple distillation
For each separation, select the most suitable technique, A, B, C or D, used to obtain the first named substance from the mixture. Each letter may be used once, more than once or not at all.
Pure water from an aqueous copper(II) sulfate solution
Ethanol from a liquid mixture of ethanol (boiling point 78∘C78^\circ\text{C}78∘C) and water (boiling point 100∘C100^\circ\text{C}100∘C)
Barium sulfate, BaSO4(s)\text{BaSO}_4(\text{s})BaSO4(s), from a suspension of barium sulfate in water
Solid copper(II) sulfate crystals, CuSO4⋅5H2O(s)\text{CuSO}_4 \cdot 5\text{H}_2\text{O}(\text{s})CuSO4⋅5H2O(s), from an aqueous solution of copper(II) sulfate
