CBSE Class 9 Answered

Partial Equation Method

Equations are balanced by partial equation method when equations contain many reactants and products and hence cannot be balanced by the hit and trial method.

In this method the overall reaction is assumed to take place through two or more simpler reactions, which can be represented by partial equations.

The steps involved are:

1. The given chemical equation is split into two or more partial equations.
2. Each partial equation is separately balanced by the hit and trial method.
3. These balanced partial equations are multiplied with suitable coefficients in order to exactly cancel out those common substances which do not appear in the overall chemical equations.
4. The balanced partial equations so obtained, are added to arrive at the balanced chemical equation.

For example to balance the equation by partial equation method: