[nno2]

2(NH₄)₂SO₄ + 2CuO  CuSO₄ + [Cu(NH₃)]₄SO₄

NH₄SO₄ :Chemical Fertilizer

[BluRay]

2(NH₄)₂SO₄ + 2CuO  CuSO₄ + [Cu(NH₃)]₄SO₄

NH₄SO₄ :Chemical Fertilizer

2(NH₄)₂SO₄ + 2CuO  CuSO₄ + [Cu(NH₃)₄]SO₄ + 2H₂O

And what do you need CuSO₄ for?

[WorkingWithPGMs]

It is a stump remover, a de-mossing treatment for wood shingle roof maintenance, and a dandy weed killer, among other uses. 

It also is easier to subject to electrolytic treatment and recover for profit on a solid Cu cathode.

[BluRay]

Ok, and why is it so important to make it instead of buying it, considered that CuO is probably not cheaper than CuSO₄?

[nno2]

Ok, and why is it so important to make it instead of buying it, considered that CuO is probably not cheaper than CuSO₄?

Japan is in the copper-oxide ceramics for very strong regulation can be obtained easily, because copper sulfate is very difficult to obtain. The forum post was not for you. Sorry

[MarZ]

But then you need to seperate CuSO4 from the complex [Cu(NH3)]4SO4 - how you go about that? Both are soluble in water if not mistaken.