How can copper sulfate be made by a neutralization reaction?


You can make copper sulfate by mixing copper(II) hydroxide and sulfuric acid in equimolar amounts:

Cu(OH)2(s) + H2SO4(aq) CuSO4(aq) + 2 H2O(l)

Allowing the solution to evaporate (without heating) produces beautiful, bright blue copper(II) sulfate pentahydrate crystals, CuSO4·5 H2O, commonly known as 'blue vitriol'. Copper(II) sulfate pentahydrate is used to kill algae in pool and reservoir water, and is used as a copper source in animal feeds.

If you heat the pentahydrate strongly, you'll drive off the hydration waters and obtain a fine white powder. This is anhydrous copper(II) sulfate, CuSO4.

You can also make copper(II) sulfate by electrolysis of copper metal in a sulfuric acid solution.

Author: Fred Senese senese@antoine.frostburg.edu



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