2Сa + O2 = 2CaO
Ca(0)-2e = Ca(+2) 2 в-ль, ок-ие
O2(0) +4e = 2O(-2) 1 ок-ль, в-ие
CaO + CO2 = CaCO3
CaCO3 -> CaO + CO2
CO2 + Na2O = Na2CO3
Na2CO3 + 2HCl = 2NaCl + CO2 + H2O
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Answers & Comments
2Сa + O2 = 2CaO
Ca(0)-2e = Ca(+2) 2 в-ль, ок-ие
O2(0) +4e = 2O(-2) 1 ок-ль, в-ие
CaO + CO2 = CaCO3
CaCO3 -> CaO + CO2
CO2 + Na2O = Na2CO3
Na2CO3 + 2HCl = 2NaCl + CO2 + H2O