CaCO3 -> CaO -> Ca(OH)2 -> CaCO3 -> Ca(Na3)2

Question

CaCO3 -> CaO -> Ca(OH)2 -> CaCO3 -> Ca(Na3)2

Answer 1

CaCO3 = CaO + CO2↑
CaO + H2O = Ca(OH)2
Ca(OH)2 + CO2 = CaCO3 + H2O
CaCO3 + 2HNO3 = Ca(NO3)2 + H2O + CO2↑