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Describe an activity to observe what hap...

Describe an activity to observe what happens when quick lime is added to water taken in a beaker. State important observation and name the type of reaction taking place.

Text Solution

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Aim: To observe what happens when quicklime is added to water taken in a beaker.
Materials Required : Quicklime (Calcium oxide), water, beaker.
Procedure :

1. Take 5 g of calcium oxide in a beaker.
2. Add-water to it slowly.
3. Touch the beaker.
4. Note down the observations.
Observations : Calcium oxide reacts with water vigorously to form calcium hydroxide with the evolution of heat.
Chemical Reaction :
`underset("Quicklime")(CaO(s)) + underset("water")(H_2O(l)) rarr underset("Slaked lime")(Ca(OH)_2(aq))" + Heat"`
Conclusion : The reaction between CaO (Calcium oxide) and `H_2O` is a combination reaction. It is an exothermic process because heat is evolved.
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