Question

How to balance the equations

Answer 1

first of all let me tell you why it's necessary to balance any equation?

balancing chemical equations means that number of atoms of elements should remain same before and after reaction. we know about law of conservation of mass. mass can neither be created nor destroyed. so it's necessary to balance the chemical equations.

now, let's consider two equations.

$\small \rm1. \: NaCl + AgNO _{3} - - > AgCl + NaNO_{3} \:$

$\rm \small 2. \: BaCl _{2} + H_{2}SO4 --> BaSO_{4} + HCl$

in first equation, we can clearly see that the number of atoms of elements in both after and before reaction is same. hence it's a balanced equation.

in second equation,

there are 2 atoms in H and Cl before reaction but only one atom in H and Cl after reaction.

so what we can do is, write 2 before HCL. (means coefficient of HCL)

and hence, we get 2 H and 2 Cl.

now it's balanced.

$\rm \small BaCl _{2} + H_{2}SO4 --> BaSO_{4} + 2HCl$

in this way, you can try balancing others. don't over think. first write any number and see..

one more thing, you can only change coefficient of the elements. don't change the number of elements like

$\rm \small HCl_2$

because if u change it, then the whole substance will change.

and also no. of atoms of any element = it's coefficient × it's number

for example 2HCl_2,

H = 2

Cl = 2 × 2 = 4

for a easy method, first you can write like this.

LHS :-

Ba = 1

Cl = 2

h = 2

So = 4

RHS :-

Ba = 1

Cl = 1

h = 1

So = 4

it'll help you to compare easily.

later you'll get used to it and then you don't have write like this for comparing.

Answer 2

Answer:

The chemical equation needs to be balanced so that it follows the law of conservation of mass. A balanced chemical equation occurs when the number of the different atoms of elements in the reactants side is equal to that of the products side. Balancing chemical equations is a process of trial and error.

hope this helps have a nice day