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Cu + 4HNO₃(stęż.) --> Cu(NO₃)₂ + 2NO₂ + 2H₂O
Cu(NO₃)₂ + 2NaOH --> Cu(OH)₂ + 2NaNO₃
Cu(OH)₂ + H₂SO₄ --> CuSO₄ + 2H₂O