Question

Complete and balance the following equation:-
$CaO+{{H}_{2}}O\to$

Answer 1

As we know that calcium oxide is also known as quicklime or burnt lime and its chemical formula is CaO. It is an oxide of alkaline earth metal which means it is basic in nature. It is a widely used chemical compound and here we have to show its reaction with water.

Complete answer:
Let us discuss about calcium oxide followed by its reaction with water molecules:
-Calcium oxide: It is also commonly referred as quicklime or burnt lime and its chemical formula is CaO. It is quite basic in nature being an oxide of metal. It is a widely used compound and is a white, alkaline, caustic crystalline solid at standard temperature conditions.
-When it reacts with water, following reaction takes place:-
$CaO+{{H}_{2}}O\to Ca{{(OH)}_{2}}$
Here calcium oxide reacts with water and accepts hydrogen ions to form calcium hydroxide. This reaction is exothermic in nature as it evolves a huge amount of heat.
-The chemical equation is balanced as follows:-
We will compare the number of atoms of different elements on both reactant and product side so as to check whether the mass on both sides of the reaction is equal or not.

Reactant side:-	Product side:-
Ca = 1	Ca = 1
H = 2	H = 2
O = 2	O = 2

It can be seen that each number of atoms of different elements is the same on both sides due to which we do not need to balance it and it will be considered as a balanced equation.
So the balanced chemical equation is: $CaO+{{H}_{2}}O\to Ca{{(OH)}_{2}}$

Note:
-Remember that the reaction of calcium oxide with water is reversible in nature. Also it induces a huge amount of thermal energy.
-Also equalize the number of atoms of different elements on both sides of the reaction so as to follow the law of conservation of mass.