A lady is planning to white wash her house. She bought 10 kg of quicklime from the market and dissolved it in 30 litres of water. On adding lime in water she noticed that the water started boiling without being heated. Give reasons for her observation. Write the corresponding equations and name the products formed.

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Solution

A suspension of slaked lime also called calcium hydroxide is formed when water is added to quicklime.

$C a O (s) + H_{2} O (l) \to C a (O H)_{2}$ + heat

Since the reaction is highly exothermic, the solution started boiling without being heated. The suspension of slaked lime is allowed to cool for some time (preferably overnight). It is then decanted and the liquid obtained is used for white washing.

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