H2SO4+ H2S→ 2H2O + 2S + SO2
CuCl2 + Ba(OH)2 →Cu(OH)2 + BaCl2
AlCl3 + 3NaOH → Al(OH)3 + 3NaCl
Al2(SO4)3 + 3BaCl2→ 2AlCl3 + 3BaSO4
4Fe + 3O2 → 2Fe2O3
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Cu + 2H2SO4 (đặc ) \(\underrightarrow{t^o}\) CuSO4 + SO2 + 2H2O
CuCl2 + 2NaOH \(\rightarrow\) Cu(OH)2 + 2NaCl
AlCl3 + 3NaOH \(\rightarrow\) Al(OH)3 + 2NaCl
Al2(SO4)3 + 3BaCl2 \(\rightarrow\) 2AlCl3 + 3BaSO4
4Fe + 3O2 \(\underrightarrow{t^o}\) 2Fe2O3
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