How to Balance a Chemical Equation

Chemistry For Class 10th Based on NCERT CHEMICAL REACTIONS AND EQUATION How to Balance a Chemical Equation

BALANCED CHEMICAL EQUATION

Following the law of conservation of mass,
- The total mass of the elements present in the products of a chemical reaction has to be equal to the total mass of the elements present in the reactants.
Or the number of atoms of each element remains the same, before and after a chemical reaction.

Example ;

Here the Number of atoms of each element in reactant and product sides are equal.
Hence, the above chemical equation is balanced.

STEPS INVOLVED IN BALANCING THE CHEMICAL EQUATION

Step I:
- To balance a chemical equation, we have to draw boxes around each formula.
- Do not change anything inside the boxes while balancing the equation.

Step II:
- List the number of atoms of different elements present in the unbalanced equation.

list of elements present in chemical reaction i.e. iron , hydrogen and water — *list of elements present in chemical reaction i.e. iron, hydrogen, and water*

Step III:
- Start balancing with the compound that contains the maximum number of atoms which may be reactant or product.

chemical reaction with balanced oxygen atom — *chemical reaction with a balanced oxygen atom*

Step IV: Fe and H atoms are still not balanced. now balance hydrogen in reaction.

balancing of hydrogen atom and iron atom — *balancing of the hydrogen atom and iron atom*

chemical equation with balanced hydrogen atom — *chemical equation with the balanced hydrogen atom*

Step V: check the equation and balance the iron.

chemical equation with balanced iron atom — *chemical equation with a balanced iron atom*

Step VI: Finally, to check the correctness of the balanced equation, we count atoms of each element on both sides of the equation.

complete balanced equation of iron and water to form a ferric oxide and hydrogen gas

The numbers of atoms of elements on both sides of the equation are equal.
This equation is now balanced.
This method of balancing chemical equations is called the hit-and-trial method.
Step VII:
- Writing Symbols of Physical States. the physical states of the reactants and products are mentioned along with their chemical formulae.
- The gaseous, liquid, aqueous, and solid states of reactants and products are represented by the notations (g), (l), (aq), and (s), respectively.

Note – The word aqueous (aq) is written if the reactant or product is present as a solution in water. the symbol (g) is used with H₂O to indicate that water is used in the form of steam.
The reaction conditions, such as temperature, pressure, catalyst, etc., for the reaction are indicated above and/or below the arrow in the equation.

photosynthesis reaction showing physical parameters above and below the arrow

Chemical Equation Balancer Calculator

How to Use the Calculator

Write the Equation In the Below Box
Write the Element Symbols Correctly.
For Example, to Write Chlorine, You must write Cl and not ~~CL.~~
To write Sulphuric Acid Write H2SO4 and not ~~H2So4~~ or ~~H2so4.~~
The answer is Presented Below.
Just Scroll down to check the answer. 🙂

IMPORTANT QUESTIONS AND ANSWERS:

Balancing chemical equation

1.Write a balanced chemical equation for the reaction between sodium chloride and silver nitrate indicating the physical state of the reactants and the products.

Ans:

2.Balance the following chemical equation : Pb(NO3)2(s) → PbO(s) + NO2(g) + O2(g)

ANS: 2Pb(NO3)2(s)→ 2PbO(s) + 4NO2(g) + O2(g)

3.Write balanced equations for the following mentioning the type of reaction involved.
(i) Aluminium + Bromine → Aluminium bromide
(ii) Calcium carbonate→ Calcium oxide + Carbon dioxide
(iii) Silver chloride→Silver + Chlorine
Answer.