U saying solid calcium oxide r u sure its a solid... Because I know pure CaO will be in powder ....///Calcium oxide(quick lime-oxide base) + water --------> calcium hydroxide(base).//
When calcium oxide mixed with water it releases heat. The reaction is exothermic and it can get very hot if only minimal water is added.( so d't touch the container). The product is a color less solution.
/// CaO + H2O ---------> Ca(OH)2///