Химическая цепь:
CuO--->CaO?
CaCO3--->CO2--->NaCO3?
CuO+Ca=CaO+Cu
CaCO₃+2HCl=CaCl₂+CO₂+H₂O
CO₂+2NaOH=Na₂CO₃+H₂O
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CuO+Ca=CaO+Cu
CaCO₃+2HCl=CaCl₂+CO₂+H₂O
CO₂+2NaOH=Na₂CO₃+H₂O