Em tham khảo nha:
\(\begin{array}{l}
a)\\
S{O_2} + 2NaOH \to N{a_2}S{O_3} + {H_2}O\\
N{a_2}S{O_3} + {H_2}S{O_4} \to N{a_2}S{O_4} + S{O_2} + {H_2}O\\
N{a_2}S{O_4} + Ba{(OH)_2} \to BaS{O_4} + 2NaOH\\
2NaOH + C{O_2} \to N{a_2}C{O_3} + {H_2}O\\
b)\\
2Cu + {O_2} \xrightarrow{t^0} 2CuO\\
CuO + 2HCl \to CuC{l_2} + {H_2}O\\
CuC{l_2} + 2NaOH \to Cu{(OH)_2} + 2NaCl\\
Cu{(OH)_2} \xrightarrow{t^0} CuO + {H_2}O\\
CuO + {H_2} \xrightarrow{t^0} Cu + {H_2}O\\
Cu + 2{H_2}S{O_4} \to CuS{O_4} + S{O_2} + 2{H_2}O\\
c)\\
2A{l_2}{O_3} \xrightarrow{\text{ điện phân nóng chảy, criolit}} 4Al + 3{O_2}\\
2Al + 6HCl \to 2AlC{l_3} + 3{H_2}\\
AlC{l_3} + 3NaOH \to Al{(OH)_3} + 3NaCl\\
2NaCl + 2{H_2}O \xrightarrow{\text{ điện phân dung dịch có màng ngăn }} 2NaOH + C{l_2} + {H_2}\\
2NaOH + CuS{O_4} \to Cu{(OH)_2} + N{a_2}S{O_4}
\end{array}\)
