A student is given a mixture of barium sulfate, copper(II) sulfate and water.
The table shows information about barium sulfate and copper(II) sulfate.
How does the student obtain copper(II) sulfate crystals from the mixture?

1 )
crystallisation followed by distillation
2 )
crystallisation followed by filtration
3 )
distillation followed by crystallisation
filtration followed by crystallisation
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