A housewife wanted her house to be whitewashed. She bought 10 kg of quicklime from the market and dissolved it in 30 litres of water. On adding quicklime to water she noticed that the water started boiling even when it was not being heated. Give reason for her observation. Write the corresponding chemical equation and name the product formed.

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Solution

Quick lime is chemically calcium oxide (CaO). When quick lime is added to water, calcium hydroxide is formed. This reaction is highly exothermic i.e. a large amount of heat is released in this process. This is why when quick lime is added to water it starts to boil even without heating.

$CaO (s) + H_{2} O (l) \to Ca (OH)_{2} (aq)$

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