K2O + H2SO4 -> Fe(OH)3 + HCl -> PbO + H2So4 _> Ca +.. -> CaCl2
K2O + H2SO4 -> Fe(OH)3 + HCl -> PbO + H2So4 _> Ca +.. -> CaCl2
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K2O + H2SO4 ->K2SO4+H2O
Fe(OH)3 + 3HCl ->FeCl3+3H2O
PbO + H2So4 _>PbSO4+H2O
Ca+2HCl--->CaCl2+H2 (strzałka w górę)