а) Fe--->FeCl2--->Fe(OH)2--->Fe(OH)3
Fe + 2HCl = FeCl2 + H2↑
FeCl2 + 2NaOH = Fe(OH)2 ↓ + 2NaCl
4Fe(OH)2 +2H2O + O2 =4Fe(OH)3↓
б) SO2--->H2SO3--->K2SO3--->BaSO3--->SO2
SO2 + H2O = H2SO3
H2SO3 + 2KOH = K2SO3 + 2H2O
K2SO3 + BaCl2 = BaSO3↓ + 2KCl
BaSO3 (t)=BaO + SO2↑
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а) Fe--->FeCl2--->Fe(OH)2--->Fe(OH)3
Fe + 2HCl = FeCl2 + H2↑
FeCl2 + 2NaOH = Fe(OH)2 ↓ + 2NaCl
4Fe(OH)2 +2H2O + O2 =4Fe(OH)3↓
б) SO2--->H2SO3--->K2SO3--->BaSO3--->SO2
SO2 + H2O = H2SO3
H2SO3 + 2KOH = K2SO3 + 2H2O
K2SO3 + BaCl2 = BaSO3↓ + 2KCl
BaSO3 (t)=BaO + SO2↑