Em tham khảo nha:

\(\begin{array}{l}
1)\\
BaC{l_2} + N{a_2}S{O_4} \to BaS{O_4} + 2NaCl\\
B{a^{2 + }} + 2C{l^ - } + 2N{a^ + } + S{O_4}^{2 - } \to BaS{O_4} + 2N{a^ + } + 2C{l^ - }\\
B{a^{2 + }} + S{O_4}^{2 - } \to BaS{O_4}\\
2)\\
{K_2}C{O_3} + Ba{(N{O_3})_2} \to BaC{O_3} + 2KN{O_3}\\
2{K^ + } + C{O_3}^{2 - } + B{a^{2 + }} + 2N{O_3}^ -  \to BaC{O_3} + 2{K^ + } + 2N{O_3}^ - \\
C{O_3}^{2 - } + B{a^{2 + }} \to BaC{O_3}\\
3)\\
Ba{(N{O_3})_2} + {H_2}S{O_4} \to BaS{O_4} + 2HN{O_3}\\
B{a^{2 + }} + 2N{O_3}^ -  + 2{H^ + } + S{O_4}^{2 - } \to BaS{O_4} + 2{H^ + } + 2N{O_3}^ - \\
B{a^{2 + }} + S{O_4}^{2 - } \to BaS{O_4}\\
4)\\
F{e_2}{(S{O_4})_3} + 6KOH \to 2Fe{(OH)_3} + 3{K_2}S{O_4}\\
2F{e^{3 + }} + 3S{O_4}^{2 - } + 6{K^ + } + 6O{H^ - } \to 2F{e^{3 + }} + 6O{H^ - } + 6{K^ + } + 3S{O_4}^{2 - }\\
F{e^{3 + }} + 3O{H^ - } \to Fe{(OH)_3}\\
5)\\
{K_2}S + FeS{O_4} \to FeS + {K_2}S{O_4}\\
2{K^ + } + {S^{2 - }} + F{e^{2 + }} + S{O_4}^{2 - } \to FeS + 2{K^ + } + S{O_4}^{2 - }\\
F{e^{2 + }} + {S^{2 - }} \to FeS\\
6)\\
N{H_4}Cl + NaOH \to NaCl + N{H_3} + {H_2}O\\
N{H_4}^ +  + C{l^ - } + N{a^ + } + O{H^ - } \to N{a^ + } + C{l^ - } + N{H_3} + {H_2}O\\
N{H_4}^ +  + O{H^ - } \to N{H_3} + {H_2}O\\
7)\\
CaC{O_3} + 2HCl \to CaC{l_2} + C{O_2} + {H_2}O\\
CaC{O_3} + 2{H^ + } + 2C{l^ - } \to C{a^{2 + }} + 2C{l^ - } + C{O_2} + {H_2}O\\
CaC{O_3} + 2{H^ + } \to C{a^{2 + }} + C{O_2} + {H_2}O\\
8)\\
FeS + 2HCl \to FeC{l_2} + {H_2}S\\
FeS + 2{H^ + } + 2C{l^ - } \to F{e^{2 + }} + 2C{l^ - } + {H_2}S\\
FeS + 2{H^ + } \to F{e^{2 + }} + {H_2}S
\end{array}\)