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   Co(NH2)2 + 2H2O =  (NH4)2CO3
    2Cu(2+) + 3CO3(2-) + 2H2O = Cu(OH)2.CuCO3 + 2HCO3(-)
    Cu(2+) + 4(NH4)2CO3 = [Cu(NH3)4](2+) + 4NH4HCO3
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   Co(NH2)2 + 2H2O =  (NH4)2CO3
    2Cu(2+) + 3CO3(2-) + 2H2O = Cu(O ...

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