Question

How do you balance $\text{CaO}+{{\text{H}}_{2}}\text{O}\to \text{Ca(OH}{{\text{)}}_{2}}$ ?

Answer 1

Hint: balancing chemical equations involves the addition of stoichiometric coefficient to the reactant and products. This is important because a chemical equation must obey the law of conservation of mass and the law of constant proportions, i.e, the same number of atoms of each element must exist on the reactant side and the product side of the equation. There are two methods of balancing one is the traditional method and other one is algebraic method.

Complete step by step answer:
This is a type of combination reaction and an exothermic reaction which gives off heat.
During balancing we count elements and make sure they are equal on oth sides.
Where $\text{Cao}+{{\text{H}}_{\text{2}}}\text{O}\to \text{Ca(OH}{{\text{)}}_{\text{2}}}$
We can see that

Reactant side		Product side
Ca	$1$	Ca	$1$
H	$2$	H	$2$
O	$1+1=2$	O	$2$

Here we can see that the atoms are equal on both the sides hence a balanced equation.
The product formed in the reaction i.e., $\text{(Ca(OH}{{\text{)}}_{\text{2}}}\text{)}$ is slaked lime. Which is used for many purposes it is used for $pH$ correction of water for disinfection it is also used to produce calcium carbonate by reaction with carbon dioxide.
Hence here we can conclude that the above reaction was already balanced.
The addition of stoichiometric coefficient to the reactants and products includes balancing chemical equations.
It is significant since the law of conservation of mass and the law of constant proportions must be enforced by a chemical equation, which is the same number of atoms of the element on the reactant side and the product side of the equation must remain.

Note: There are several methods of balancing a chemical reaction like hit and trial method in which an element with least occurrence frequency is balanced first. In this method least whole number coefficients are used to balance the reaction..
Stoichiometric coefficients describe the total number of molecules of a chemical species that participate in a chemical reaction. It provides ratios between the reacting species and the products formed in the reaction.