Giải thích các bước giải:
2.
\(\begin{array}{l}
A:NaOH\\
D:NaOH\\
E:C{O_2}\\
B:Ca{(OH)_2}\\
C:CaC{l_2}\\
C{O_2} + NaOH \to NaHC{O_3}\\
C{O_2} + 2NaOH \to N{a_2}C{O_3} + {H_2}O\\
NaHC{O_3} + NaOH \to N{a_2}C{O_3} + {H_2}O\\
N{a_2}C{O_3} + C{O_2} + {H_2}O \to 2NaHC{O_3}\\
2NaHC{O_3} + Ca{(OH)_2} \to CaC{O_3} + N{a_2}C{O_3} + 2{H_2}O\\
N{a_2}C{O_3} + CaC{l_2} \to 2NaCl + CaC{O_3}
\end{array}\)
\(\begin{array}{l}
5.\\
(1)Fe + 2HCl \to FeC{l_2} + {H_2}\\
(2)FeC{l_2} + Cu{(N{O_3})_2} \to Fe{(N{O_3})_2} + CuC{l_2}\\
(3)Fe{(N{O_3})_2} + 2NaOH \to Fe{(OH)_2} + 2NaN{O_3}\\
(4)4Fe{(OH)_2} + {O_2} \to 2F{e_2}{O_3} + 4{H_2}O\\
(5)2Fe + 3C{l_2} \to 2FeC{l_3}\\
(6)FeC{l_3} + 3AgN{O_3} \to Fe{(N{O_3})_3} + 3AgCl\\
(7)Fe{(N{O_3})_3} + 3NaOH \to Fe{(OH)_3} + 3NaN{O_3}\\
(8)2Fe{(OH)_3} \to F{e_2}{O_3} + 3{H_2}O\\
(9)FeC{l_2} + 2C{l_2} \to 2FeC{l_3}\\
(10)2FeC{l_3} + Fe \to 3FeC{l_2}
\end{array}\)
