A list of techniques used to separate mixtures is given below.
fractional distillation
simple distillation
crystallisation
filtration
diffusion
From the list choose the most suitable technique to separate the following:
water from aqueous copper(II) sulfate.............................
Helium from a mixture of helium and argon.......................
Copper(II) sulfate from aqueous copper(II) sulfate.
Ethanol from aqueous ethanol.
Barium sulfate from a mixture of water and barium sulfate.
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