# Why Do We Balance The Chemical Equation ?

By BYJU'S Exam Prep

Updated on: September 25th, 2023

We balance a chemical equation because it is a fundamental step in chemistry that ensures the equation obeys the law of conservation of mass and the law of conservation of charge.

For example:

2H + O → 2HO

In this equation, there are two hydrogen atoms on the left side (in the H₂ molecule) and four hydrogen atoms on the right side (in the 2H₂O molecules). By balancing the equation, we can see that we need to multiply the H₂ molecule on the left side by 2 to achieve an equal number of hydrogen atoms on both sides.

## Law Of Conservation Of Mass To Balance Chemical Equation

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. This means that the total number and types of atoms present in the reactants must be equal to the total number and types of atoms in the products. By balancing the chemical equation, you ensure that the number of atoms of each element is the same on both sides of the equation.

Balancing the equation also ensures that the law of conservation of charge is satisfied. In a chemical reaction, the total charge must be conserved. This means that the sum of the charges on the reactants must be equal to the sum of the charges on the products. Balancing the equation helps ensure that the charges are balanced correctly.

## Balanced Chemical Equation

A balanced chemical equation is a representation of a chemical reaction using chemical formulas and coefficients. It shows the reactants on the left side of the equation, the products on the right side, and the relative amounts of each substance involved.

To balance a chemical equation, you adjust the coefficients (whole numbers placed in front of the chemical formulas) to ensure that the number of atoms of each element is the same on both sides of the equation.

For example: The combustion of propane (C₃H₈) with oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O). The unbalanced equation is:

Unbalanced Equation: C₃H₈ + O₂ → CO₂ + H₂O

Balanced Equation: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

Summary:

## Why do we balance the chemical equation?

Balancing chemical equations is important because it allows us to accurately represent the reactants and products involved in a chemical reaction, and it ensures that the fundamental laws of conservation of mass and charge are upheld.

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