Giải thích các bước giải:
\(\begin{array}{l}
1.\\
a)\\
Ca + {O_2} \to CaO\\
CaO + {H_2}O \to Ca{(OH)_2}\\
Ca{(OH)_2} + 2HCl \to CaC{l_2} + 2{H_2}O\\
b)\\
Fe{S_2} + 2{O_2} \to Fe + 2S{O_2}\\
S{O_2} + {O_2} \to S{O_3}\\
S{O_3} + {H_2}O \to {H_2}S{O_4}\\
{H_2}S{O_4} + Ba{(OH)_2} \to BaS{O_4} + 2{H_2}O\\
c)\\
6Fe + 4{O_2} \to 2F{e_3}{O_4}\\
2F{e_3}{O_4} + 10{H_2}S{O_4} \to 3F{e_2}{(S{O_4})_3} + S{O_2} + 10{H_2}O\\
F{e_2}{(S{O_4})_3} + 3Ba{(OH)_2} \to 3BaS{O_4} + 2Fe{(OH)_3}\\
d)\\
Fe{S_2} + 2HCl \to FeC{l_2} + {H_2}S + S\\
S + Cu \to C{\rm{uS}}\\
CuS + 2HCl \to CuC{l_2} + {H_2}S\\
CuC{l_2} + {H_2}S{O_4} \to CuS{O_4} + 2HCl\\
e)\\
CuS{O_4} + BaC{l_2} \to BaS{O_4} + CuC{l_2}\\
CuC{l_2} + 2NaOH \to Cu{(OH)_2} + 2NaCl\\
Cu{(OH)_2} \to CuO + {H_2}O\\
CuO + S \to Cu + S{O_2}
\end{array}\)
\(\begin{array}{l}
2.\\
a){H_2}S{O_4} + BaC{l_2} \to BaS{O_4} + 2HCl\\
b)2HN{O_3} + CaC{O_3} \to Ca{(N{O_3})_2} + C{O_2} + {H_2}O\\
c)2KOH + 2NaHS{O_4} \to N{a_2}S{O_4} + {K_2}S{O_4} + {H_2}O\\
d)CuO + 2HCl \to CuC{l_2} + {H_2}O\\
e)S{O_2} + NaOH \to NaHS{O_3}\\
g)C{O_2} + 2NaOH \to N{a_2}C{O_3} + {H_2}O
\end{array}\)
