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Bot When water is added to quick-lime, a highly exothermic reaction occurs, resulting in the formation of calcium hydroxide and a release of heat. This reaction is known as slaking, hydration or slaked lime formation. The chemical equation for this reaction is:
CaO (quicklime) + H2O (water) -> Ca(OH)2 (calcium hydroxide)
The resulting calcium hydroxide is a white, powdery substance that is commonly used in construction, agriculture, and other industries. This reaction also produces steam due to the heat generated, so it is important to add water slowly and carefully to prevent splashing or boiling.