The colour of Copper sulphate is blue because Copper ions absorb light in all frequencies except blue which is reflected instead.
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The anhydrous copper(II) sulfate is white, the pentahydrate is blue.Iron is gray.
No colour
This is a simple displacement reaction - the more reactive magnesium displaces the less reactive copper from a solution of its salt. .... magnesium + copper sulphate ---> copper + magnesium sulphate Mg + CuSO4 ----> MgSO4 + Cu the blue colour of the copper sulphate will disappear and the silver coloured magnesium will be replaced by brown-red copper metal. Hope this helps. :)
formula : cuso4 chemical name: copper sulphate
Copper sulfate itself is white/colorless when anhydrous. However, it's hygroscopic and the pentahydrate (the usual form) is blue... in fact, it's just about the same color as the sidebar over to the left there.