Cách 1:
\((CuO,FeO)\buildrel { + HCl\,\,dư} \over\longrightarrow {\rm{dd}}(CuC{l_2},FeC{l_2},HCl\,dư)\buildrel { + Fe(đủ)} \over
\longrightarrow Cu \downarrow + FeC{l_2}\buildrel {lọc} \over\longrightarrow Cu\)
Cách 2: \(Fe + 2HCl \to FeC{l_2} + {H_2}\)
\((CuO,FeO)\buildrel { + {H_2},{t^o}} \over\longrightarrow (Cu,Fe)\buildrel { + HCl\,dư} \over\longrightarrow Cu + FeC{l_2} + HCl\,du\buildrel {lọc} \over\longrightarrow Cu\)
