Question

Q15. What happens when quick lime is added to water? Write the reaction involved?
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Answer 1

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When Calcium oxide i.e. quick lime is added to water filled in a bucket, it reacts vigorously with water to produce slaked lime (calcium hydroxide) releasing a large amount of heat.

Reaction - 2CaO + 2H2O => 2Ca(OH)2 + Heat

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Answer 2

Quick lime reacts with water to give Calcium Hydroxide.

Also,

The reaction can be reversed by heating Calcium Hydroxide to give Calcium Oxide ( Quick lime ) and water.

Reaction:

$\sf 2CaO_{(s)} + 2H_{2}O_{(l)} \longrightarrow 2Ca(OH)_{2 \: (s) }$