Question

The reaction of water with slaked lime is studied by ______.
A. putting slaked lime into water taken in a test tube.
B. putting a lot of water into slaked lime
C. sprinkling a little water on slaked lime
D. none of the above method

Answer 1

Hint: Slaked lime is also known as Calcium hydroxide. Adding water to calcium hydroxide is an exothermic reaction which means a lot of heat is released. To handle an exothermic reaction, think what must be done and that will be the required answer.

Complete step by step answer:
We are given to find out how the reaction of water with slaked lime is done.
Slaked lime $Ca{\left( {OH} \right)_2}$ is also known as calcium hydroxide or lime water which is formed by mixing calcium oxide with water.
$CaO + {H_2}O \to Ca{\left( {OH} \right)_2}$
The reaction of slaked lime with water is an exothermic reaction. This reaction releases a lot of heat energy.
For this reaction to undergo, water must be added to slaked lime but not vice-versa because it does not get dissolved when we add slaked lime to water.
So the slaked lime must be taken in a beaker and lots of water must be added to it to handle the released heat and to dissolve it properly.
Sprinkling a little water on slaked lime also will not produce any result because slaked lime requires lots of water to get dissolved.
Therefore the correct answer is Option B, the reaction of water with slaked lime is studied by putting a lot of water into slaked lime.

Hence we can conclude that option B is correct.

Note:
An exothermic reaction is a reaction in which a lot of heat is released by the reactants and an endothermic reaction is a reaction in which a lot of heat is absorbed by the reactants to form products. Do not confuse an exothermic reaction with an endothermic reaction. When we try putting slaked lime into water taken in a test tube, the test tube might break because of the released heat so this method must be avoided.