Calcium oxide reacts with water to form calcium hydroxide:
CaO + H2O -> Ca(OH)2
Calcium hydroxide then reacts with hydrochloric acid to form calcium chloride:
Ca(OH)2 + 2HCl -> CaCl2 + 2H2O
Therefore, the overall reaction is:
CaO + H2O + 2HCl -> CaCl2 + 2H2O
Which simplifies to:
CaO + 2HCl -> CaCl2
Calcium oxide reacts with water to form calcium hydroxide:
CaO + H2O -> Ca(OH)2
Calcium hydroxide then reacts with hydrochloric acid to form calcium chloride:
Ca(OH)2 + 2HCl -> CaCl2 + 2H2O
Therefore, the overall reaction is:
CaO + H2O + 2HCl -> CaCl2 + 2H2O
Which simplifies to:
CaO + 2HCl -> CaCl2