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Ca + H2CO3 ---> CaCO3 + H2
CaO + H2CO3 ---> CaCO3 + H2O
Ca(OH)2 + H2CO3 ---> CaCO3 + 2H2O
Ca(OH)2 + CO2 ---> CaCO3 + H2O
CaO + CO2 ---> CaCO3
b) siarczek srebra(I)
2Ag + S ---> Ag2S
Ag2O + H2S ---> Ag2S + H2O
2AgOH + H2S ---> Ag2S + 2H2O
2AgNO3 + H2S ---> Ag2S + 2HNO3
2AgNO3 + K2S ---> Ag2S + 2KNO3