2H2O-đp->2H2+O2
2NaCl-dpnc->2Na+Cl2
2NaCl+2H2O-đpcó mn>2NaOH+H2+Cl2
H2+Cl2-as-2HCl
2FeS2+11\2O2-to>Fe2O3+4SO2
Fe2O3+6Hcl->2Fecl3+3H2O
FeCl3+3NaOH->Fe(OH)3+3NaCl
FeS2+O2→Fe2O3+SO2FeS2+O2→Fe2O3+SO2 (nhiệt độ)
NaCl+H2O→NaOH+Cl2+H2NaCl+H2O→NaOH+Cl2+H2 (đpdd có màng ngăn)
Cl2+H2→2HClCl2+H2→2HCl (ánh sáng)
Fe2O3+HCl→FeCl3+H2OFe2O3+HCl→FeCl3+H2O
FeCl3+NaOH→Fe(OH)3+NaClFeCl3+NaOH→Fe(OH)3+NaCl
NaOH+SO2→Na2SO3