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Ca+H2O----->...
K+H2O---->...
Ca(OH)2+CO2----->....
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Răspuns :

CaO4H2C.......................................................................................................
Ca+2H2O->Ca(OH)2+H2
2K+2H2O->2KOH+H2
Ca(OH)2+CO2->CaCO3+H2O