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What happens chemically when quick lime ...

What happens chemically when quick lime is added to water ?

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Calcium hydroxide (or slaked lime) is formed accompanied by a hissing sound. So much heat is evolved during the reaction that the reaction mixture starts boiling. The chemical equation for the reaction is:
`underset("Quick lime")(CaO_((s)))+H_(2)O_((aq))tounderset("Slaked lime")(Ca(OH)_(2(aq)))+"heat"`
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