Anhydrous copper(II) sulfate can be made by heating hydrated copper(II) sulfate.
$CuS{O_4}.5{H_2}O \to CuS{O_4} + 5{H_2}O$
What can be added to anhydrous copper(II) sulfate to turn it into hydrated copper(II) sulfate?
1 )
concentrated sulfuric acid
2 )
sodium hydroxide powder
3 )
sulfur dioxide
water
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