Write the reaction equations: CaCO3 – Ca (HCO3) 2 – CaCO3 – CaCl2 – CaS

1) CaCO3 + CO2 + H2O → Ca(HCO3)2;

2) Ca(HCO3)2 → CaCO3 + CO2 + H2O;

3) CaCO+ 2HCl → CaCl2 + CO2 + H2O;

4) CaCl2 + H2S → CaS + 2HCl.



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