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Chemical formulas:

- CuO, Cu(II)-oxide, cupric oxide (monocopper oxide), black

- Cu2O, Cu(I)-oxide, cuprous oxide (dicopper oxide), red

- sulfuric acid, H2SO4

CuO + H2SO4 --> CuSO4 + H2O , cupric sulfate, blue solution

Cu2O also reacts with dilute sulfuric acid forming CuSO4 by:

Cu2O + 2 H2SO4 --> CuSO4 + H2O + H2, cupric sulfate, blue solution

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