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CaO+H2O→Ca(OH)2

Ca(OH)2+SO2→CaSO3·1/2H2O+1/2H2O

Ca(OH)2+2HCl+2H2O→CaCl2·4H2O

CaSO3·1/2H2O+3/2H2O+1/2O2→CaSO4·2H2O

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