Đáp án:
Bạn tham khảo nha !
Giải thích các bước giải:
\(\begin{array}{l}
3.\\
a)\\
S + {O_2} \to S{O_2}\\
S{O_2} + 2NaOH \to N{a_2}S{O_3} + {H_2}O\\
N{a_2}S{O_3} + {H_2}S{O_4} \to N{a_2}S{O_4} + S{O_2} + {H_2}O\\
S{O_2} + \dfrac{1}{2}{O_2} \to S{O_3}
\end{array}\)
\(\begin{array}{l}
S{O_3} + {H_2}O \to {H_2}S{O_4}\\
{H_2}S{O_4} + FeO \to FeS{O_4} + {H_2}O\\
FeS{O_4} + 2KOH \to {K_2}S{O_4} + Fe{(OH)_2}\\
Fe{(OH)_2} + {H_2}S{O_4} \to FeS{O_4} + 2{H_2}O\\
FeS{O_4} + BaC{l_2} \to FeC{l_2} + B{\rm{aS}}{O_4}
\end{array}\)
\(\begin{array}{l}
b)\\
{H_2}S + 2KOH \to {K_2}S + 2{H_2}O\\
{K_2}S + 2HCl \to 2KCl + {H_2}S\\
{H_2}S + Fe \to FeS + {H_2}\\
FeS + 2HCl \to FeC{l_2} + {H_2}S\\
2{H_2}S + S{O_2} \to 2{H_2}O + 3S\\
S + {H_2} \to {H_2}S\\
2{H_2}S + 3{O_2} \to 2{H_2}O + 2S{O_2}\\
2S{O_2} + {O_2} + 2{H_2}O \to 2{H_2}S{O_4}\\
6{H_2}S{O_4} + 2Fe \to F{e_2}{(S{O_4})_3} + 3S{O_2} + 6{H_2}O\\
S{O_2} + 2NaOH \to N{a_2}S{O_3} + {H_2}O
\end{array}\)
\(\begin{array}{l}
c)\\
{H_2}S{O_4} + N{a_2}S{O_3} \to N{a_2}S{O_4} + S{O_2} + {H_2}O\\
2S{O_2} + {O_2} + 2{H_2}O \to 2{H_2}S{O_4}\\
6{H_2}S{O_4} + 2Fe \to F{e_2}{(S{O_4})_3} + 3S{O_2} + 6{H_2}O\\
F{e_2}{(S{O_4})_3} + 6NaOH \to 2Fe{(OH)_3} + 3N{a_2}S{O_4}\\
2Fe{(OH)_3} + 3{H_2}S{O_4} \to F{e_2}{(S{O_4})_3} + 6{H_2}O\\
F{e_2}{(S{O_4})_3} + 6KOH \to 2Fe{(OH)_3} + 3{K_2}S{O_4}\\
{K_2}S{O_4} + BaC{l_2} \to 2KCl + B{\rm{aS}}{O_4}
\end{array}\)
