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   Cu(2+) + 2OH(-) = Cu(OH)2
    2Cu(2+) + 2OH(-) + SO4(2-) = Cu2(OH)2SO4
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    Cu(OH)2  = CuO + H2O
      2Cu2(OH)2SO4 = 4CuO + 2H2O + 2SO2 + O2
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   4CuO = 2Cu2O + O2
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