Question #b1cb9

1 Answer
Aug 22, 2016

Answer:

Do you mean calcium oxide and water, by any chance?

Explanation:

I don't think that calcium oxide, #"CaO"#, reacts with hydrogen gas, #"H"_2#, so I'm going to assume that you want to know about the reaction between calcium oxide and water, #"H"_2"O"#.

Calcium oxide, also called quicklime, will react with water to form calcium hydroxide, #"Ca"("OH")_2#, also called slacked lime.

#"CaO"_ ((s)) + "H"_ 2"O"_ ((l)) -> "Ca"("OH")_ (2(s))#

Calcium hydroxide is relatively soluble in water, but the amount that does dissolve dissociates completely to produce a basic solution of #"pH" ~~ 12#.

It's worth mentioning that this reaction is quite exothermic, meaning that heat is being given off as calcium hydroxide is produced by the reaction.

http://www.wonderwhizkids.com.sg/chemistry/chemical-reactions/chemical-equations